Who’s Who
Meet the Team Schooling Bullies in Teach You a Lesson
Juvenile Justice’s Kim Moo-yul and Lee Sung-min reunite to knock sense into violent students in this new K-drama.
June 11, 2026
Teach You a Lesson K-Drama Cast and Characters Guide - Netflix Tudum
When schools don’t do enough to keep their toughest bullies in line, a different kind of teacher has to step up to help. Enter the Educational Rights Protection Bureau (ERPB), a fictional government agency at the heart of the new action-packed K-drama Teach You a Lesson. The bureau was created to protect victims of bullying and restore order in schools whenever anyone — students, teachers, or even parents — goes too far.
The situations in Teach You a Lesson aren’t basic schoolyard taunts or stolen lunch money — they include serious psychological and physical abuse with devastating consequences. Therefore, the ERPB requires a formidable team ready to whip these schools into shape (like, literally). Actors Kim Moo-yul and Lee Sung-min and director Hong Jong-chan reunite for this series after working together on Juvenile Justice (2022). ERPB founder Choi Gang-seok (Lee) and inspector Na Hwa-jin (Kim) apply unflinching ferocity to their pursuit of peace.
Below, meet the squad at the heart of the bureau (including a few ex-military), who’ll stop at nothing to protect students’ rights and restore justice in schools throughout Seoul.
Kim Moo-yul
as Na Hwa-jin
About the Character
Recruited after serving in a highly secretive, specialized sector of the military, Na Hwa-jin now works as an inspector of the ERPB. Armed with an unshakeable ease and a serious punch, Hwa-jin is the agency’s most valuable asset, restoring order in schools and bringing justice to victims of bullying.
Previously In
Eungyo
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Lee Sung-min
as Choi Gang-seok
About the Character
As the minister of education and the founder of the ERPB, Gang-seok employs an exceptionally skilled team of special agents to protect students, and is fiercely committed to the cause.
Previously In
No Other Choice
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Jin Ki-joo
as Im Han-rim
About the Character
Another former military operative, Han-rim is an ERPB inspector who takes pleasure in her role. To keep bullies in line, she uses any intimidation techniques she deems appropriate.
Previously In
Undercover High School
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Pyo Ji-hoon
as Bong Geun-dae
About the Character
The ERPB’s deputy director, Geun-dae, is more tech whiz than muscle, so he’s often tasked with going undercover for the bureau.
Previously In
Encounter
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