Quick answer: The Teach You a Lesson cast is led by Kim Moo-yul as Na Hwa-jin, Lee Sung-min as Choi Gang-seok, Jin Ki-joo as Im Han-rim and Pyo Ji-hoon as Bong Geun-dae. Netflix Tudum describes them as part of the fictional Teachers’ Rights Protection Bureau, a team sent into troubled schools when bullying and disorder cross the line.
If you already read our Teach You a Lesson OTT release date guide, this is the cast-first companion. The release article gives you the Netflix date, trailer and watchlist call. This guide focuses on who plays whom, what the bureau setup means, and why the actor combination is important for this action K-drama.
Teach You a Lesson cast list
| Actor | Character | What to know |
| Kim Moo-yul | Na Hwa-jin | A central inspector in the Teachers’ Rights Protection Bureau. |
| Lee Sung-min | Choi Gang-seok | Another key bureau figure in the anti-bullying action setup. |
| Jin Ki-joo | Im Han-rim | Part of the main bureau team shown in Netflix’s cast details. |
| Pyo Ji-hoon | Bong Geun-dae | Rounds out the principal team in the Netflix K-drama. |
| Hong Jong-chan | Director | Netflix Tudum highlights him as the director of the series. |
| Lee Nam-kyu | Writer | Netflix Tudum lists him as the writer. |
Kim Moo-yul as Na Hwa-jin
Kim Moo-yul plays Na Hwa-jin, one of the main faces of the Teachers’ Rights Protection Bureau. The role sits at the centre of the show’s promise: when the usual school system cannot protect victims, these inspectors step in with a much sharper style of discipline.
For viewers, Na Hwa-jin is likely to be the entry point into the bureau’s method. Netflix’s trailer and Tudum preview frame the team as no-nonsense officials who are not afraid to fight back. That makes Kim Moo-yul’s presence important because the character has to sell both authority and action.
Lee Sung-min as Choi Gang-seok
Lee Sung-min plays Choi Gang-seok. In a show built around school conflicts, adult failure and punishment, his character gives the bureau another serious force. The casting also matters because Netflix Tudum notes that Kim Moo-yul and Lee Sung-min reunite with director Hong Jong-chan after Juvenile Justice.
That connection is useful context. Teach You a Lesson is not being sold as a light campus drama. It is closer to a tough action drama about what happens when bullying, parents, teachers and institutions all collide. Lee Sung-min’s presence helps underline that heavier tone.
Jin Ki-joo as Im Han-rim
Jin Ki-joo plays Im Han-rim, another member of the main bureau team. Netflix’s official cast listing places her alongside Kim Moo-yul, Lee Sung-min and Pyo Ji-hoon, which makes her one of the four key names viewers should remember before starting the series.
The character details are being kept simple before release, but the setup suggests Im Han-rim will be part of the team dynamic rather than a distant side role. In a story about inspectors entering tense school environments, that group chemistry is likely to decide how convincing the action and moral conflict feel.
Pyo Ji-hoon as Bong Geun-dae
Pyo Ji-hoon plays Bong Geun-dae. His character completes the main four-person bureau lineup highlighted by Netflix. The role should give the series another angle inside the team, especially if the show balances serious anti-bullying conflict with moments of personality and friction among the inspectors.
For readers who are deciding whether to try the show, the important point is simple: this is not a one-person revenge story. The cast is being presented as a bureau team, so the appeal depends on how the four leads work together when they enter a school where respect has already collapsed.
Who directs and writes Teach You a Lesson?
Netflix Tudum lists Hong Jong-chan as director and Lee Nam-kyu as writer. That creative team detail is worth noting because the premise needs a careful balance. The action has to feel satisfying, but the bullying and school-pressure angle also needs enough weight to avoid becoming only a fight-of-the-week idea.
IMDb lists the title as a 2026 TV series with 10 episodes for the main cast. The Netflix release date is June 5, 2026, and the platform describes the series as TV-MA, so viewers should expect a mature action drama rather than a soft school story.
Why the cast matters
The cast matters because Teach You a Lesson has a very direct hook: a government bureau enters schools when normal systems fail. That idea can only work if the actors make the bureau feel intimidating, credible and morally complicated at the same time.
Kim Moo-yul and Lee Sung-min give the show its serious front line, while Jin Ki-joo and Pyo Ji-hoon complete the team structure shown in Netflix’s official material. If the chemistry works, the cast could be the reason the series becomes more than a simple anti-bullying action drama.
FAQ
Who plays Na Hwa-jin in Teach You a Lesson?
Kim Moo-yul plays Na Hwa-jin in Teach You a Lesson.
Who plays Choi Gang-seok in Teach You a Lesson?
Lee Sung-min plays Choi Gang-seok in Teach You a Lesson.
Who are the main Teach You a Lesson cast members?
The main cast includes Kim Moo-yul, Lee Sung-min, Jin Ki-joo and Pyo Ji-hoon.
When does Teach You a Lesson release on Netflix?
Teach You a Lesson releases on Netflix on June 5, 2026.