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 10, 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 — go 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
Watch them on Netflix
Lee Sung-min
as Choi Gang-seok
About the Character
As the minister of education and the founder of the ERPB, Gang-seok is employs an exceptionally skilled team of special agents to protect students, and is fiercely committed to the cause.
Previously In
No Other Choice
Watch them on Netflix
Jin Ki-joo
as Im Han-rim
About the Character
Another former military operative, Ki-joo 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
Watch them on Netflix
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
Watch them on Netflix
Related Tags
Shop Teach You a Lesson
Discover More Who’s Who
A guide to the ensemble of this sharp, funny workplace rom-com.
Everything you need to know about the friend group and their A-list connections.
Alfred Molina and Geena Davis as retirees in a new sci-fi series.
Matthew Law and Y’lan Noel lead the thrilling series from the creator of Power.
A deep dive on the romantic drama’s characters and the actors who play them.
Some people are born with power. These goofballs found theirs in a garbage dump.
What happens when stars from Love Is Blind, Vanderpump Rules, and more collide?
What other actors bring Shelby Van Pelt’s best-selling novel to life?
Discover More Action
Overwhelmed with grief, the hardened assassin loses control.
Kim Moo-yul and Lee Sung-min make the principal's office look like paradise.
When money’s on the line, these contestants’ true colors shine.
Plus: The Four Seasons stays on vacay, and War Machine climbs the Most Popular list.
Global hits you shouldn’t miss.
Seth Rollins vs. Je’Von Evans vs. Talla Tonga vs. Ricky Saints.
These films are ready to stream … now.
It’s time to rejoin Dante’s journey into the underworld.
Popular Now
A new teaser offers your first lick at the live-action pup, unleashing in 2027.
Stream Voicemails for Isabelle, Office Romance, a new season of Avatar: The Last Airbender, and more.
Watch the drama series based on the experience of André and Alex Hanscombe now.
