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
Watch 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 employs an exceptionally skilled team of special agents to protect students, and is fiercely committed to the cause.
Previously In
No Other Choice
Watch on Netflix
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
Watch 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 on Netflix
Related Tags
Shop Teach You a Lesson
Who’s Who
Are they too hot to handle? Or will Harry find his perfect match?
Explore the dangerous dynamics of the Bellarie dynasty in the shocking drama.
Who is the mysterious boy from Jackie’s past who turns up in Silver Falls?
Get to know the blokes and birds entering the experiment across the pond.
Connor Swindells, Patrick J. Adams, and Merritt Wever star in the series.
Mason Gooding, Marcello Hernández, Ben Marshall, and Kam Patterson also star.
The actors star as will-they, won’t-they love interests in the upcoming series.
The royal palace’s deepest secrets come back to haunt their masters.
Action
Sharpen your pencils and settle in for a stream.
See some photos from the final season now.
Plus Take a Hike!, SEAL Team, The Girl with the Dragon Tattoo, and more.
From online to onscreen.
My Life with the Walter Boys makes a strong debut on the English TV list.
That’s how you know they’re great.
Plus Ricky Gervais Alley Cats, A Child of My Own, Our Sticky Love, and more.
Man your battle stations while watching these depictions.
Latest News
Popular Now
Have you watched them all yet?
The Pogues are out for blood in this thrilling sneak peek.
A woman meets a man online who she later discovers is a serial killer.
Go under the surface to answer your deepest questions about the sci-fi thriller.
