Teach You a Lesson

Teach You a Lesson (2026) K-Drama: Cast, Story, Episodes, Release Date & Where to Watch

Teach You a Lesson (2026), also known by its Korean title 참교육 (Chamgyoyook), is a South Korean action school drama that combines intense action, social commentary, comedy, and a controversial approach to school discipline. The Netflix limited series stars Kim Moo-yul, Lee Sung-min, Jin Ki-joo, and Pyo Ji-hoon and is based on the popular Korean webtoon Get Schooled by Chae Yong-taek and Han Ga-ram.

What Is Teach You a Lesson About?

Teach You a Lesson takes place in a school system where teachers have gradually lost their authority and are increasingly unable to deal with violent, disruptive, or influential students. As school violence and conflicts between students, teachers, and parents become serious social problems, the government creates a new organization called the Educational Rights Protection Bureau.

The bureau has an unusual mandate: its inspectors are allowed to use unconventional methods, including physical intervention, to deal with students who abuse their power and to restore order inside troubled schools.

At the center of the story is Na Hwa-jin, played by Kim Moo-yul. As an inspector for the Educational Rights Protection Bureau, Hwa-jin is sent into schools where ordinary disciplinary systems have failed. Instead of simply following traditional procedures, he confronts bullies, powerful families, corrupt adults, and students who believe they are above the rules.

This creates the central appeal of the drama: what happens when someone is finally given the authority to fight back against people who have learned how to exploit the system?

Teach You a Lesson Story

The story begins with the collapse of authority inside schools. Teachers struggle to discipline students, while wealthy and powerful parents can use their influence to protect their children. At the same time, some students take advantage of the system to bully and intimidate others.

The government responds by establishing the Educational Rights Protection Bureau. Na Hwa-jin becomes one of its most unconventional inspectors and is sent from one troubled school to another.

Rather than treating every incident as an ordinary school disciplinary case, Hwa-jin investigates the people behind each problem and confronts those responsible directly. His methods are aggressive, unpredictable, and often far removed from traditional education.

The series therefore works as both an action K-drama and a social drama, using school conflicts to explore questions about authority, responsibility, bullying, privilege, and the limits of justice.

Kim Moo-yul as Na Hwa-jin

Kim Moo-yul takes the lead role as Na Hwa-jin, an inspector working for the Educational Rights Protection Bureau. Netflix describes Hwa-jin as an unconventional inspector who steps into chaotic schools and uses his authority to restore order.

Hwa-jin is not portrayed as a typical teacher or school administrator. He approaches problems more like an investigator and enforcer, which gives the series much of its action-oriented style.

His character is particularly important because Teach You a Lesson constantly asks whether extreme methods can be justified when the conventional system has failed.

Teach You a Lesson Cast

The main cast of Teach You a Lesson includes:

Kim Moo-yul as Na Hwa-jin

Kim Moo-yul plays Na Hwa-jin, the central inspector of the Educational Rights Protection Bureau. He is sent to troubled schools to investigate serious disciplinary problems and restore order.

Lee Sung-min as Choi Kang-seok

Lee Sung-min plays Choi Kang-seok, the Minister of Education and a major figure connected to the creation of the Educational Rights Protection Bureau.

Jin Ki-joo as Im Han-rim

Jin Ki-joo plays Im Han-rim, an investigator who works alongside Hwa-jin. Her involvement adds another perspective to the bureau's unconventional approach to solving school problems.

Pyo Ji-hoon as Bong Geun-dae

Pyo Ji-hoon plays Bong Geun-dae, who becomes an important ally in Hwa-jin's investigations. Netflix's episode descriptions highlight Geun-dae's involvement in Hwa-jin's efforts to confront school gangs and protect students.

Other cast members include Kim Jong-soo, Ahn Ha-young, Lee Bong-joon, and additional actors appearing across the different school cases.

Teach You a Lesson Episodes

Teach You a Lesson has one season with 10 episodes. The series premiered on June 5, 2026, and the complete limited series is available through Netflix.

The first episode introduces Na Hwa-jin as he arrives at a school dealing with a powerful politician's spoiled son. Rather than allowing the situation to continue, Hwa-jin takes control of the case and begins showing exactly how the new bureau operates.

Later episodes expand the story beyond ordinary school bullying, involving school gangs, exploitation, corruption, and increasingly complicated conflicts between students, parents, teachers, and the authorities.

Each case gives Hwa-jin and the bureau another opportunity to demonstrate their unusual methods while also exposing different problems within the education system.

Is Teach You a Lesson Based on a Webtoon?

Yes. Teach You a Lesson is based on the Korean webtoon Get Schooled, created by Chae Yong-taek and Han Ga-ram. The television adaptation was developed for Netflix with Hong Jong-chan directing and Lee Nam-kyu, Kim Da-hee, and Moon Jong-ho credited among the writers.

The original webtoon provides the foundation for the show's controversial premise: when ordinary school discipline is no longer enough, specially authorized officials are sent in to deal with students and adults who abuse the system.

Teach You a Lesson Genre

The drama mixes several genres rather than staying strictly within the school-drama category.

Action: The series features physical confrontations and high-intensity encounters between Hwa-jin and the people responsible for violence and abuse.

School Drama: Much of the story takes place inside schools and focuses on students, teachers, parents, and education-related conflicts.

Drama: Beneath the action are serious themes involving bullying, authority, social inequality, and institutional failure.

Comedy: The unconventional behavior of the bureau and some of its characters also gives the series moments of humor.

Netflix officially categorizes the series as a limited drama, while other databases classify it across action, adventure, drama, and comedy.

Where to Watch Teach You a Lesson

Teach You a Lesson is a Netflix original limited series and is available to stream on Netflix. The official Netflix listing confirms the series' 2026 release, 10-episode first season, main cast, and TV-MA rating.

Watch Teach You a Lesson on Netflix

Is Teach You a Lesson Worth Watching?

If you enjoy K-dramas that combine action, school violence, revenge, investigations, and social commentary, Teach You a Lesson is an interesting series to add to your watchlist.

Its biggest difference from a traditional school K-drama is the protagonist. Na Hwa-jin is not a helpless teacher who has to work within a restrictive system. He is specifically given unusual authority to enter schools and confront problems that ordinary institutions have failed to solve.

That creates a strong power-fantasy element while allowing the drama to explore more serious questions about how far authority should go when protecting victims.

The series is particularly suited to viewers who enjoyed Korean dramas centered around bullying, revenge, corruption, and institutional justice but want something with more direct action.

Final Thoughts

Teach You a Lesson (2026) is a distinctive Korean school-action drama built around a simple but provocative idea: when schools can no longer protect students or teachers, someone has to step in and restore order.

With Kim Moo-yul leading the cast as Na Hwa-jin, the drama turns school discipline into an action-driven battle against bullying, privilege, corruption, and abuse of power. Its combination of social issues and high-intensity action makes it different from many conventional school K-dramas.

With 10 episodes available on Netflix, Teach You a Lesson is a relatively easy binge-watch for viewers looking for a complete 2026 K-drama rather than a long-running series.