Boy, With Caution Cast, Characters and Korean BL Drama Guide

Boy, With Caution premieres September 30, 2026, and stars Ryu Se-il as Jang Ki-woo and Ha Jung-hoon as Lee Hyun-jae. The Korean BL drama is produced by Nakwon Mansion, directed and written by Lee Son-eum, and is scheduled for release through Heavenly.

The series follows a 32-year-old temporary high-school teacher whose career was derailed by a damaging rumor and a 21-year-old student repeating a school year. Their meeting creates the central relationship of the drama. Because the story involves a teacher and student, viewers should expect the series to deal with a deliberately sensitive power dynamic rather than a conventional workplace romance.

Who plays Jang Ki-woo in Boy, With Caution?

Ryu Se-il plays Jang Ki-woo. Ki-woo is a temporary high-school teacher whose adult life has been shaped by the pressure to appear faultless. A rumor involving a student four years earlier damaged the future he had imagined and kept him from taking the teacher certification exam, leaving him moving from one contract teaching job to another.

That history matters because Ki-woo is not introduced as a carefree romantic lead. His fear of judgment, concern about reputation and emotional isolation are built directly into the premise.

Who plays Lee Hyun-jae?

Ha Jung-hoon plays Lee Hyun-jae, a 21-year-old student. Hyun-jae is presented as someone who has struggled to belong and who becomes emotionally drawn to Ki-woo after the teacher approaches him differently from the people who usually judge him.

The age of the character is important context. Current pre-release descriptions identify Hyun-jae as 21, even though the story takes place in a high-school setting because he is repeating a year.

What is Boy, With Caution about?

Boy, With Caution is a Korean BL drama about Jang Ki-woo and Lee Hyun-jae meeting at school and becoming increasingly drawn to one another. The story combines romance with social pressure, reputation, emotional trauma and the complications created by their teacher-student positions.

The title is also seen as 소년, 주의 and has previously circulated under the English name Mind the Boy. These are alternate references to the same 2026 series.

How many episodes does Boy, With Caution have?

Current listings indicate eight episodes. A production/database listing places the planned run from September 30 into November 2026. As with any pre-release schedule, exact episode timing can still change, so the streaming platform should be treated as the final authority once the show launches.

When does Boy, With Caution premiere?

Boy, With Caution is scheduled to premiere September 30, 2026. Nakwon Mansion’s own project page lists the same release date, making it the strongest available confirmation.

Where can you watch Boy, With Caution?

The production company identifies Heavenly as the investor/distributor, and current drama listings identify Heavenly as the network/platform. International access can vary by territory, so viewers should check Heavenly’s regional availability at launch.

Who created Boy, With Caution?

Lee Son-eum is credited as both director and writer in current listings. Nakwon Mansion is the production company.

If you are following September Korean releases, you may also want our Dive Into You cast guide. Our Flex X Cop Season 2 guide tracks another Korean series returning in 2026.

Is Boy, With Caution a BL drama?

Yes. Both the production information and current Korean-drama coverage identify Boy, With Caution as a BL romance drama.

Is Boy, With Caution the same as Mind the Boy?

Yes. Mind the Boy has been used as an earlier alternate English title for the project. The current release title is Boy, With Caution.