100 Days of Deception Cast, Characters and Netflix K-Drama Story Explained

Kim You-jung stars as Lee Ga-kyeong, a brilliant pickpocket recruited for a resistance mission, opposite Park Jin-young as Kim Tae-woong, an interpreter also known as Sato Hideo. Kim Hyun-joo plays resistance operative Yoo So-ran, with Lee Mu-saeng as journalist Yoo Philip and Jin Sun-kyu as powerful colonial official Sato Shinichi. The Korean historical spy romance premieres on Netflix on October 10, 2026.

The title promises a romance built on lies, but those lies have consequences far beyond a secret courtship. Set in Japanese-occupied Gyeongseong in 1932, the series places a young woman with exceptional street instincts inside a dangerous political institution. Her assignment depends on being believed by the very people she hopes to deceive.

Below is a spoiler-free guide to the confirmed actors, the names and aliases that may cause confusion, the characters’ connections and what has actually been announced before the premiere. The story and cast details come from Netflix and the drama’s pre-release publicity; future plot outcomes remain unknown.

Netflix lists the drama in its October lineup. tvN’s broadcast schedule is for South Korea, while Netflix episode availability and subtitle options may vary by region. The reported 16 episodes are the planned season length, not a promise that all 16 will arrive on Netflix on day one.

What is 100 Days of Deception about?

Lee Ga-kyeong knows how to disappear in plain sight. As Gyeongseong’s most skilled pickpocket, she survives by reading faces, anticipating movement and knowing exactly when to act. Those abilities catch the attention of people whose risks are considerably bigger than stolen wallets. The independence movement needs someone capable of slipping into the Japanese Government-General of Korea, and Ga-kyeong is offered a dangerous undercover assignment.

She enters the institution posing as an interpreter trainee named Geum Seo-hee. Her goal is to acquire secrets from within the colonial government, a mission that would be difficult even without the threat of discovery. The most unexpected complication is Kim Tae-woong, a gifted interpreter who works inside the same power structure under the Japanese name Sato Hideo. He is also the adopted son of Sato Shinichi, a senior figure in the administration and a target of the resistance.

The story is therefore not simply about whether Ga-kyeong can steal classified information. Every conversation with Tae-woong tests the boundary between professional deception and genuine feeling. If she trusts him, she risks the mission. If she uses him, she risks a connection that may be real. The show’s promotional material establishes that tension, but it does not establish which person will ultimately betray the other.

There is also a second battle underway. Resistance fighter Yoo So-ran and Korean-American correspondent Yoo Philip maintain their own false identities and a marriage of convenience while trying to bring down Sato Shinichi. Their separate operation makes the characters’ relationships a web of competing loyalties, rather than a single straightforward love triangle.

100 Days of Deception cast and characters

A note on names: Korean names can appear in different Romanizations across Netflix, Korean publicity and entertainment databases. Lee Ga-kyeong may be written Lee Ga-kyung or Lee Ga-gyeong; Kim Tae-woong is also known as Sato Hideo. These are not separate characters.

Meet the five main characters

Kim You-jung as Lee Ga-kyeong / Geum Seo-hee

Kim You-jung leads the series as Lee Ga-kyeong, a quick-thinking young woman whose talent for theft becomes an unlikely asset to the independence movement. The job requires more than nimble fingers. Under the name Geum Seo-hee, she must convince officials that she belongs inside an institution designed to detect threats. Her survival depends on listening carefully, managing suspicion and keeping her real motives hidden.

Ga-kyeong is an interesting spy protagonist precisely because she does not begin as a polished secret agent. Her experience comes from the streets, where one mistake can cost her freedom. That background gives her a different relationship to authority than the people she encounters in the government offices. The official material presents her as someone motivated by a desire for freedom, but it leaves room for the series to reveal how her loyalties develop over the 100-day assignment.

Fans may recognize Kim You-jung from My Demon and Netflix’s coming-of-age romance 20th Century Girl. This project gives her a more politically charged role in which attraction and survival are inseparable.

Park Jin-young as Kim Tae-woong / Sato Hideo

Park Jin-young, also known to music fans as Jinyoung of GOT7, plays Kim Tae-woong. Inside the colonial administration he is known as Sato Hideo, a multilingual interpreter whose polished manner suggests he is perfectly at home in an elite institution. Yet his adopted position in Sato Shinichi’s family makes his allegiance more complicated than it first appears.

The series’ early publicity describes Tae-woong as a man with an unspoken sorrow. That matters because he is not simply a romantic lead placed near the heroine for convenience. He is someone who can understand what officials are saying, move between languages and operate within the structures Ga-kyeong wants to penetrate. His access makes him both a possible ally and an enormous danger to her cover.

Park Jin-young previously appeared in Yumi’s Cells and starred opposite Park Bo-young in Our Unwritten Seoul. Here, his character’s dual name and family background appear central to the mystery. Whether he knows more about Ga-kyeong than he admits is a question for the episodes to answer.

Kim Hyun-joo as Yoo So-ran

Kim Hyun-joo plays Yoo So-ran, a skilled sharpshooter and one of the key figures in the anti-Japanese resistance group Gugukdan. So-ran draws Ga-kyeong into the mission and gives her a role that brings the movement closer to its target. She is not merely a mentor watching from the sidelines; the announced storyline gives her a personal reason to confront Sato Shinichi.

Pre-release character information explains that So-ran has adopted a different identity and maintains a fake marriage with journalist Yoo Philip. Beneath the careful planning is a longstanding desire for revenge. She has to weigh that intensely personal motive against a wider political cause, and the distinction could shape how she treats people who take risks on her behalf.

Kim Hyun-joo is familiar to Netflix viewers from Hellbound and The Bequeathed. The new role appears designed for the same ability to communicate determination without making a character’s emotional life too easy to read.

Lee Mu-saeng as Yoo Philip

Lee Mu-saeng portrays Yoo Philip, a Korean-American correspondent working in Gyeongseong and a covert member of Gugukdan. His position gives him a different kind of leverage from So-ran’s marksmanship or Ga-kyeong’s infiltration. As a journalist, he can question the official version of events and bring political pressure to people who would prefer to operate without scrutiny.

Philip’s marriage to So-ran is a strategic cover, but the script-reading description also suggests he is hiding feelings for her. That detail adds another form of deception to the drama: unlike Ga-kyeong’s false name, Philip’s secret may be emotionally costly even when it helps the cause. Publicity describes him as thoughtful and restrained, someone who balances personal concern with the movement’s objectives.

Audiences may recognize Lee Mu-saeng from The Glory and The Silent Sea. His character seems likely to connect the resistance’s intelligence work with the political world Ga-kyeong must navigate.

Jin Sun-kyu as Sato Shinichi

Jin Sun-kyu takes on the role of Sato Shinichi, a powerful official in the Government-General of Korea and the adopted father of Kim Tae-woong. So-ran’s faction identifies him as an assassination target. That makes him the common point of danger for Ga-kyeong’s undercover assignment, the resistance’s plans and Tae-woong’s family connections.

Shinichi is portrayed in early material as ambitious, ruthless and deeply invested in maintaining his position. His authority is not limited to giving orders. It shapes the choices of subordinates and family members who depend on him, which means the impact of his decisions reaches beyond the political offices where he works.

Known for Extreme Job and Through the Darkness, Jin Sun-kyu brings a recognizable screen presence to the central antagonist. The important unanswered question is not whether the resistance considers Shinichi a threat, but how far he will go when the overlapping disguises around him begin to unravel.

Supporting cast and why their roles matter

The larger ensemble gives the drama a sense of life beyond its five headline characters. People working in homes, clinics, private businesses and government departments have different access to information and different reasons to keep quiet. The announced supporting roles are particularly useful for understanding how Ga-kyeong’s mission might move between public and private spaces.

The supporting cast reveals how the show intends to build its stakes. Kim Seung-eok represents the business elite collaborating with colonial power. Kwak Woon-hak represents ordinary civilians helping the resistance behind respectable day jobs. Ryu Gwan-sil knows the Sato household from the inside, while Suzuki works with the language and paperwork that can expose an undercover operative. The potential for information to travel between these worlds is part of the drama’s appeal.

Character relationships explained without spoilers

Ga-kyeong and Tae-woong: A pickpocket turned undercover trainee meets an interpreter who has one foot in the colonial administration and another in a complicated personal history. Attraction is dangerous because either person’s identity may be incomplete. The romance is confirmed; its outcome is not.

Tae-woong and Shinichi: Shinichi is Tae-woong’s adoptive father. That relationship places Tae-woong very close to the individual the resistance wants to eliminate. It also gives the story a built-in conflict between family obligation and conscience, without telling viewers in advance which side he will choose.

So-ran and Philip: They present themselves as a married couple for strategic reasons while operating within Gugukdan. The arrangement is more than a disguise for the audience to decode; it is a way for two people to pursue the same cause while concealing different emotional truths.

So-ran, Ga-kyeong and Shinichi: So-ran recruits Ga-kyeong for the infiltration effort and sees Shinichi as a target. Ga-kyeong must then work near the person So-ran wants to destroy. That arrangement makes success dependent on coordination, timing and trust between people who cannot safely tell the whole truth.

If you enjoy dramas in which an ensemble carries several interconnected mysteries, our Bodies cast guide offers another example of a story where understanding the characters is central to following the plot.

Why the 1932 Gyeongseong setting matters

The series is set in 1932 Gyeongseong, the name used for Seoul under Japanese colonial rule. The wider historical period, 1910 to 1945, is central to the premise: the Japanese Government-General of Korea was an instrument of colonial administration, while the independence movement included people working through different forms of resistance. These are real historical circumstances, although the show’s named protagonists and individual mission belong to its dramatized story.

Choosing this setting changes the meaning of everyday scenes. A conversation in an office can involve surveillance and the possibility of arrest. A seemingly ordinary workplace can become a place where secrets are collected or passed along. Language also matters: interpreters move between people and institutions that do not share equal power, so a mistranslated or overheard sentence could carry enormous consequences.

That combination of politics and private lives is part of why historical dramas can make familiar suspense mechanisms feel fresh. If you prefer period settings with political pressure and character-driven mystery, you can also explore our The Defeated cast guide, about a different era and country, postwar Berlin.

The difference is important: 100 Days of Deception should not be treated as a documentary or a reconstruction of a verified 100-day operation. Its story uses a historical background to dramatize questions about freedom, fear, survival and divided loyalties.

Is 100 Days of Deception a romance or a spy thriller?

It is both. The official Netflix listing places the show among romantic and political period dramas, while the plot centers on covert infiltration, resistance operations and the threat of discovery. The romantic pairing is not separate from the spy story; it becomes risky precisely because of where the characters work and whom they know.

For viewers coming for Kim You-jung and Park Jin-young, the emotional hook is the question of whether a relationship that begins amid lies can become trustworthy. For thriller fans, the larger appeal is an ensemble of characters with competing agendas. So-ran’s revenge and Philip’s covert journalism mean the story is not dependent on romance alone.

A related but contemporary example of Korean screen storytelling built around difficult personal decisions is A Normal Family. The plots are different, but both invite audiences to think about what people are willing to conceal when loyalty is on the line.

Netflix release, episodes and how to watch

100 Days of Deception is scheduled to premiere on Saturday, October 10, 2026. Netflix includes the title in its October new-release guide, and Korean broadcaster tvN has announced a Saturday-Sunday 9:10 p.m. KST slot. Pre-release coverage identifies the drama as a 16-episode production.

Because the series is a television drama with an ongoing Korean broadcast schedule, viewers should not assume that every episode will be released on Netflix simultaneously. Availability, rollout dates, audio options and subtitles can differ by territory. For the most reliable information in your country, check the official Netflix title page on or after the premiere.

As of October 8, the show has not premiered. That means there is no responsible basis for an ending explanation, a verdict on the full season or claims about surprise character deaths. This guide can be updated after episodes air, especially if Netflix provides a detailed episode list or the drama introduces additional characters.

Who is behind the series?

The director is Yoo In-sik, whose credits include Extraordinary Attorney Woo and the Dr. Romantic series. Those projects are quite different in subject matter from a 1930s resistance thriller, but they help explain why viewers are interested in the mix of strong character work and emotionally complicated stakes here. The screenwriter is Ryu Bo-ri, whose name also appears as Rheu Bo-ri in Netflix’s creator credits.

The first script-reading coverage emphasized ordinary people pursuing hope in a period of political oppression. That framing matters. A show built around a talented thief and secret operatives could have been presented mainly as a glamorous game of disguises, but the promotional material repeatedly returns to the wider independence struggle that gives the mission its purpose.

None of that guarantees a successful finished series. It does, however, make the creative direction clear ahead of release: this is a character-led historical suspense story rather than an action spectacle with romance added afterward.

What to watch for when the drama begins

Three details are worth keeping in mind during the opening episodes. First, pay attention whenever a character is addressed by a different name. The difference between Lee Ga-kyeong and Geum Seo-hee, or Kim Tae-woong and Sato Hideo, reflects a role they are performing and potentially a relationship they are protecting. Missing an alias may make later conversations harder to follow.

Second, notice who controls access to information. Ga-kyeong works undercover, Tae-woong translates, Philip reports, Suzuki interprets foreign communications and Ryu Gwan-sil has intimate knowledge of a powerful household. The drama gives information to people in very different positions, and it may not be obvious who has the fullest picture.

Third, separate what the trailers explicitly establish from what they merely suggest. Pre-release posters point toward love, revenge and divided loyalties, but they do not confirm a tragic ending or the identity of a traitor. The pleasure of this kind of series comes from seeing whether the characters’ public stories can survive contact with their private motivations.

Frequently asked questions

Who plays Lee Ga-kyeong in 100 Days of Deception?

Kim You-jung plays Lee Ga-kyeong, a skilled pickpocket who enters the Japanese colonial administration undercover using the alias Geum Seo-hee.

Who is the male lead in 100 Days of Deception?

Park Jin-young, also known as GOT7’s Jinyoung, plays interpreter Kim Tae-woong, who is also called Sato Hideo.

When does 100 Days of Deception come out on Netflix?

Netflix lists the premiere for October 10, 2026. Local release timing and episode availability may vary by region.

How many episodes does 100 Days of Deception have?

Pre-release production information identifies a 16-episode season. That does not mean all 16 episodes will be released on Netflix at once.

Is 100 Days of Deception the same drama as 100 Days of Lies?

Yes. 100 Days of Lies is another English rendering of the Korean title 100일의 거짓말. Netflix lists the series as 100 Days of Deception.

Is 100 Days of Deception based on a true story?

The series is fictional, set against the real historical background of Japanese colonial rule in Korea. Its named undercover mission has not been presented as a documented true event.

Who plays Yoo So-ran and Sato Shinichi?

Kim Hyun-joo plays resistance operative Yoo So-ran, while Jin Sun-kyu plays senior colonial official Sato Shinichi, the target of her revenge plot.

Is 100 Days of Deception a Netflix original?

Netflix carries the drama internationally, while tvN is its Korean broadcaster. It is safest to describe it as a Korean drama streaming on Netflix rather than claim Netflix is its only broadcaster.

Final thoughts

100 Days of Deception has an unusually clear dramatic premise: a gifted thief must maintain a false identity in hostile territory while developing feelings for a man tied to the institution she is spying on. The central cast extends that premise through a resistance leader seeking revenge, a journalist living behind a convenient marriage and an official whose power touches all their lives.

The series premieres on October 10, and the biggest questions are still the ones the drama needs to earn: Can Ga-kyeong complete her mission without losing herself? What does Tae-woong actually believe? And can the resistance hold together when personal feelings threaten strategic plans? For now, the confirmed cast and character connections are a strong reason to put the series on a historical K-drama watchlist.

Sources

Official platform information: Netflix show page  |  Netflix October 2026 schedule

Cast and production updates: Soompi group poster preview  |  Soompi supporting-cast reveal  |  Soompi script-reading report

Character and release coverage: Soompi character posters  |  Soompi preview schedule  |  The Korea Times report