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This write-up has a few major spoilers, for a spoiler-free review of ‘Teach You a Lesson’, click here.

The Korean action drama ‘Teach You a Lesson’ has become one of Netflix’s biggest international hits for the year 2026. Centered around the Education Rights Protection Bureau (ERPB), a special unit established by South Korea’s Ministry of Education, the series follows a team of inspectors tasked with cracking down on bullying, violence, harassment, corruption, and abuse within Seoul’s schools. Whether the culprit is a student, a teacher, a parent, or even a politician, nobody is supposed to be beyond the ERPB’s reach.

Part of the show’s appeal lies in how satisfying it is to watch justice being delivered. Time and again, the inspectors step into situations where ordinary teachers and students have been failed by the system, then proceed to teach the offenders a lesson they won’t soon forget. Let’s look at ‘Teach You a Lesson’ through the eyes of viewers and rank the episodes according to their IMDb scores.

Since IMDb scores fluctuate over time, we’ve included screenshots of the ‘Teach You a Lesson’ episode ratings as they appeared when this article was written.

1. Episode 1 — 9.0/10 (1.9K votes)

It’s hardly surprising that the pilot remains the highest-rated episode of the season.

The story introduces Na Hwa-jin, the ERPB’s lead inspector, as he arrives at a school where a student’s suicide has been quietly swept under the rug by the school administration because the perpetrator happens to be the son of a powerful politician. Armed with special authority that frees the ERPB from many of the restrictions placed on teachers, Hwa-jin wastes little time taking action.

What makes the premiere work so well is how clearly it establishes his character. Around victims, he’s patient, compassionate, and understanding. Around bullies, he’s an absolute suited-up devil.

The episode also reveals Hwa-jin’s personal stake in reforming the education system. His fiancée, a dedicated teacher who genuinely believed troubled students could change, was brutally murdered by one of her pupils. That tragedy fuels much of the story that follows and gives the series an emotional backbone beyond its action-heavy premise.

2. Episode 10 — 9.0/10 (1.2K votes)

If Episode 1 gives ‘Teach You a Lesson’ its powerful beginning, Episode 10 delivers an equally satisfying ending.

The season finale sees Hwa-jin and the ERPB going rogue after political pressure threatens to shut them down. What begins as another school investigation eventually exposes an organized student gang selling drugs and a powerful figure working behind the scenes to sabotage the Education Ministry.

More importantly, the episode brings Hwa-jin face-to-face with the man responsible for his fiancée’s death in a violent face-off. The emotional payoff lands because the show has been building toward this confrontation from the very first episode.

So despite some pacing issues in the middle stretch, ‘Teach You a Lesson’ succeeds because it starts strong and ends even stronger.

3. Episode 5 — 8.9/10 (1.3K votes)

One of the season’s most memorable stories shifts the spotlight away from student bullies and onto abusive parents.

This ‘Teach You a Lesson’ episode follows elementary school teacher Choi Ji-seon, whose cheerful and optimistic outlook has been completely eroded by relentless harassment from a particularly obsessive mother. The parent stalks her social media accounts, follows her home, bombards her with complaints, and constantly criticizes her teaching methods while making deeply personal attacks.

Song Si-an delivers one of the strongest guest performances of the season as Ji-seon. Watching a caring young educator slowly break under the pressure is genuinely heartbreaking.

Fortunately, the ERPB decides to fight fire with fire. Hwa-jin temporarily takes over the classroom and begins bombarding the mother with endless questions about how her son should be taught, effectively giving her a taste of her own medicine. It’s one of the funniest and most satisfying episodes in the series while still tackling a serious issue.

4. Episode 6 — 8.8/10 (1.2K votes)

Episode 6 of ‘Teach You a Lesson’ tackles juvenile crime and drug abuse, following four teenage delinquents who believe they’re untouchable because of South Korea’s relatively lenient treatment of underage offenders.

The group sells drugs on school grounds, terrorizes fellow students, and repeatedly escapes meaningful punishment. And their parents are excessively lenient, turning a blind eye to their behavior.

Part of the episode’s popularity likely comes from how directly it confronts the topic of juvenile justice. The story raises uncomfortable questions about whether existing laws are sometimes exploited by repeat offenders who know the system will treat them lightly because of their age.

The episode also features some of the harshest consequences seen anywhere in the series, as the young criminals find themselves facing realities far more frightening than they expected.

5. Episode 2 — 8.7/10 (1.5K votes)

Arguably the most entertaining chapter of ‘Teach You a Lesson’.

Hwa-jin arrives at a notoriously violent school where classes barely function, teachers are routinely assaulted, and nearly every student seems destined for a future in organized crime. Rival groups constantly fight one another in hopes of impressing a senior student who has successfully joined a criminal gang.

Amid all the chaos, there is exactly one student who simply wants to study.

The setup feels almost like something lifted straight out of a webtoon or comic book, but that’s precisely why it works. Watching the ERPB take control of an institution that has completely collapsed into lawlessness makes for some of the show’s most crowd-pleasing moments.

6. Episode 3 — 8.6/10 (1.4K votes)

Teach You a Lesson Episode 3 introduces Im Han-rim, the ERPB’s hot-headed former military operative played by Jin Ki-joo, and immediately gives her a fascinating case.

The villain this time is a popular student influencer who weaponizes her online following against teachers. She spreads malicious rumors, manipulates public opinion, and even makes false allegations of sexual misconduct against a teacher, pushing him toward suicide without showing the slightest remorse.

It’s one of the series’ strongest examinations of social media culture and the dangers of giving teenagers unrestricted influence online. The story also highlights the increasingly difficult challenge schools face when smartphones and online platforms become tools for harassment. In a touching twist, it’s revealed that several students write to the ERPB to intervene and help protect a beloved student being targeted by the influencer.

7. Episode 4 — 8.6/10 (1.3K votes)

At first glance, Teach You a Lesson’s Episode 4 appears to be about a student who violently attacks a respected teacher at a high-ranking school.

The truth turns out to be far more complicated.

As the investigation unfolds, the ERPB discovers widespread academic corruption involving wealthy families, coaching institutes, and teachers willing to manipulate grades. The supposedly problematic student is actually being targeted because he comes from an ordinary background and threatens the rankings of students from influential families.

While some of the evidence falls into the ERPB’s hands a little too conveniently, the episode remains deeply satisfying thanks to its willingness to expose educational inequality and favoritism.

8. Episode 9 — 8.6/10 (1.1K votes)

Despite being Teach You a Lesson’s penultimate episode, Episode 9 ranks lower than one would expect.

The most compelling part of the story is the return of the student who murdered Hwa-jin’s fiancée. Released after serving just three years due to his status as a juvenile offender, he returns to the same high-school he was at before being imprisoned. Claiming he has changed, the young man approaches the ERPB with a new bullying case.

The problem is that the case itself takes a while to become interesting. The student at its center never emerges as a particularly compelling character, and the nature of the bullying initially feels vague compared to the more immediately gripping cases featured elsewhere in the season. It’s obvious that something suspicious is happening, but because the full picture isn’t revealed right away, the episode spends much of its first half without a clear objective, making it one of the slower chapters to get through.

Despite his personal feelings, Hwa-jin agrees to investigate, and also finds new clues to help explain his fiance’s murder case better. The real highlight comes from Han-rim going undercover within the student group, leading to some entertaining moments as she gradually exposes the truth about the bullying.

9. Episode 7 — 8.5/10 (1.2K votes)

This chapter of ‘Teach You a Lesson’ follows a desperate father seeking help after his son becomes addicted to online gambling and then goes missing without a trace.

ERPB’s investigation uncovers a predatory gambling operation specifically targeting students, getting them hooked before intimidating parents into making payments.

While the idea of an entire school becoming consumed by gambling feels somewhat exaggerated compared to the show’s other stories, the episode still delivers an effective warning about how easily teenagers can be manipulated by addictive apps and exploitative online businesses.

10. Episode 8 — 8.4/10 (1.2K votes)

Ironically, even though this is lowest-rated episode of ‘Teach You a Lesson’ it might be one of the season’s most emotional chapters.

The story focuses on Jung Hyeon-min, a promising student whose mother is determined to turn him into a doctor at any cost. Subjected to impossible expectations and a punishing schedule, Hyeon-min has been conditioned to obey rather than think for himself.

Kim Tae-young gives one of the strongest performances among the show’s student cast members, convincingly portraying a teenager who has become trapped by expectations he never chose.

When Hyeon-min collapses after being secretly given medication intended to boost his academic performance, the ERPB uncovers a disturbing pattern of parental abuse disguised as ambition. The episode explores how children can become victims not only of school bullies but also of the crushing expectations imposed by their own families.

Personally, I’d rank this one much higher than IMDb users did, perhaps at number 3.

Wrapping it up

Looking at Teach You a Lesson’s IMDB rankings, a clear pattern emerges. Viewers gravitated most strongly toward episodes where the ERPB delivered immediate, satisfying justice against powerful bullies, corrupt individuals, and abusive adults. The pilot and finale of ‘Teach You a Lesson’ are clear fan favorites, most likely because they tie directly into Hwa-jin’s personal story, while Episodes 5 and 6 resonate because they tackle issues that feel painfully real.

Even when ‘Teach You a Lesson’ occasionally leans into exaggerated, almost comic-book storytelling, its underlying message is of course straight-forward: schools cannot function when victims are left to fend for themselves, and sometimes the adults causing the problems need to be held accountable just as much as the students.

That said, ‘Teach You a Lesson’ works best when viewed as a fantasy rather than a serious policy proposal, something I mentioned in an earlier review of the show too. The ERPB’s habit of solving problems with fists, intimidation, and the occasional beatdown makes for entertaining television, but the idea that violence can reliably cure violence is a far more complicated and controversial question in the real world. So enjoy all the action, cheer when the bullies get what they deserve, but leave the life lessons to the real educators.

Teach You a Lesson is streaming on Netflix.

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