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| Teach You a Lesson Relationship Chart Explained: Who’s Connected to Who in Netflix’s Most Talked-About Korean Drama. (Credits: Netflix) |
Before viewers even press play, Teach You a Lesson (참교육) is already one of the most heavily discussed Korean dramas of 2026. Set inside a fictional government agency called the Educational Rights Protection Bureau (ERPB), the Netflix series throws audiences into a world where school conflicts, difficult parents, troubled students and bureaucratic headaches are tackled by a team that believes paperwork alone is not always enough. Whether that sounds brilliant or slightly terrifying depends on who you ask, but one thing is certain: the drama's character relationships are the key to understanding everything.
At the centre of the story stands Na Hwa Jin, played by Kim Mu Yeol. He is the face of the ERPB and the man usually sent when situations spiral completely out of control. A former military operative turned education investigator, Hwa Jin has a reputation for solving problems in ways that are far from traditional.
While most school officials might schedule another meeting, Hwa Jin tends to arrive with a completely different approach. His mission throughout the series is to restore order in schools where authority has collapsed and vulnerable people are left without protection.
The most important relationship in the drama sits above him. Lee Sung Min's Choi Gang Seok serves as the Education Minister and the architect behind the ERPB itself. If Hwa Jin is the person carrying out missions on the ground, Gang Seok is the man pulling the strings from the top.
Having spent decades in politics, he understands how power works better than almost anyone. The relationship between Gang Seok and Hwa Jin is built on trust, but viewers can also expect disagreements as political realities often clash with field operations. One wants results, the other has to survive public scrutiny. It is rarely a simple partnership.
Alongside Hwa Jin is Im Han Rim, played by Jin Ki Joo, the second major ERPB inspector. Han Rim brings a very different energy to the team. While Hwa Jin often charges straight into dangerous situations, Han Rim is more analytical and strategic.
She gathers evidence, tracks hidden connections and often uncovers details others miss. Together, they form the drama's central partnership. Think of them as the classic action duo where one kicks down the door and the other already knows what is waiting behind it.
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| Netflix’s Teach You a Lesson Cast Guide: Character Map, Relationship Chart and What to Expect |
Adding another layer to the team is Bong Geun Dae, portrayed by P.O (Pyo Ji Hoon). Unlike several other characters, Geun Dae is an original creation for the television adaptation rather than someone lifted directly from the webtoon.
He works as a brilliant administrative officer within the ERPB and supports operations behind the scenes. His intelligence, technical skills and lighter personality help balance the darker atmosphere of the series. In a drama packed with tension and confrontations, Geun Dae often acts as the person reminding viewers that not everyone in the building looks permanently stressed.
Away from the bureau, Ha Young's Choi Ga Yun plays a crucial role as Na Hwa Jin's fiancée. Her presence offers a glimpse into Hwa Jin's personal life, something viewers may desperately need considering how much chaos surrounds his professional one.
Through Ga Yun, audiences see a side of Hwa Jin that colleagues rarely witness. Their relationship provides emotional grounding and helps explain what motivates him beyond his duties.
Meanwhile, Kim Jong Soo takes on the role of a Member of Parliament connected to larger political developments within the story. Characters like him represent the broader systems surrounding education, government and policy.
As the series progresses, political interests, public opinion and institutional pressures become almost as significant as the conflicts happening inside schools.
The relationship chart itself is surprisingly straightforward despite the large cast. At the top sits Choi Gang Seok, overseeing the ERPB and guiding its mission. Directly under him are field inspectors Na Hwa Jin and Im Han Rim, who carry out investigations and interventions.
Supporting them is Bong Geun Dae, the bureau's talented administrative expert. Outside the agency, Choi Ga Yun connects to Hwa Jin's private life, while politicians and school officials create obstacles, alliances and complications around the team. Nearly every major storyline eventually circles back to these core relationships.
As for what viewers should expect, this is not a traditional school drama filled with classroom romance and exam stress. Teach You a Lesson blends action, political drama, dark humour and social commentary.
The series focuses heavily on authority, responsibility and the complicated reality of modern education. There are intense confrontations, large-scale investigations and enough bureaucratic tension to make even office workers feel slightly nervous.
The drama arrives with considerable attention because of the original webtoon's history. Some readers praised its fast-paced storytelling and satisfying problem-solving structure, while others criticised certain creative choices and controversial storylines.
As a result, reactions leading up to the Netflix release have been mixed. Some fans are excited to see respected actors such as Kim Mu Yeol, Lee Sung Min and Jin Ki Joo bring these characters to life, while others remain cautious about how sensitive themes will be adapted for television.
Early online discussions show exactly that divide. Supporters believe the experienced cast and creative team could transform the source material into a more balanced and emotionally nuanced drama.
Skeptics are waiting to see whether the adaptation can maintain the webtoon's intensity without repeating elements that previously sparked criticism. In other words, expectations are high, concerns are real, and absolutely nobody seems neutral.
With its combination of action, politics, education and a cast packed with acclaimed performers, Teach You a Lesson looks set to become one of Netflix's most debated Korean dramas of the year.
Whether viewers end up cheering for Na Hwa Jin's unconventional methods, admiring Im Han Rim's intelligence or questioning Choi Gang Seok's decisions, the relationship map suggests one thing: every character matters, and every connection will have consequences.
So whose side are you already on before the first episode even begins? The fearless field agent, the strategic minister, or the genius administrator quietly keeping everything from falling apart?