Kim Moo-yul’s career extends beyond Teach You a Lesson. His stage work, crime films and television roles offer different entry points for viewers discovering him as inspector Na Hwa-jin. This career archive covers selected work through June 2026; it is not a running account of the drama’s Netflix ranking.
The stage career behind the screen roles
In its June 27, 2026 profile, The Korea Herald traced Kim’s training at Anyang Arts High School and work in Seoul’s Daehangno theater district. His musical credits included Thrill Me and Spring Awakening, which brought him a best-actor award at the 2009 Korea Musical Awards.
The same profile recounted financial hardship he had discussed on You Quiz on the Block in 2024, including interrupted studies and work outside acting. Those are attributed biographical details, not an explanation of how he performs violence on screen. A fictional character’s behavior should not be treated as evidence about the actor’s private life.
Three roles to compare with Na Hwa-jin
- Juvenile Justice (2022): the courtroom route. Kim plays a juvenile-court judge rather than a field inspector. Netflix describes a drama about young offenders and the social responsibility surrounding their cases. This is the closest thematic companion if the school and institutional questions in Teach You a Lesson interest you more than its action.
- The Roundup: Punishment (2024): the antagonist route. Kim plays Baek Chang-ki, the criminal opposing Ma Dong-suk’s detective. It reverses the position he occupies in the school series: the character is the threat to be stopped, not the official sent to intervene.
- Forgotten (2017): the mystery route. Netflix’s synopsis centers on a brother who returns after an abduction and seems changed. Kim stars alongside Kang Ha-neul. Choose this for a contained film mystery rather than another episodic story about an institution confronting wrongdoing; its premise is more useful to know in advance than its eventual explanation.
This selection compares character functions and story formats, not box-office size or popularity. The judge, antagonist and returning brother give a more specific starting point than treating every Kim Moo-yul role as another version of a tough inspector.
Where Teach You a Lesson fits
Netflix’s announcement identifies Kim as Na Hwa-jin in a fictional bureau that intervenes when schools fail victims. It names Hong Jong-chan as director and places Kim alongside Lee Sung-min, Jin Ki-joo and Pyo Ji-hoon. The premise brings his career back to questions of authority, but uses an action-driven intervention team instead of the courtroom framework of Juvenile Justice.
For the show’s premise, dated audience results and season-two reporting, see our Teach You a Lesson dossier. Those changing measurements are separate from the career milestones collected here. The linked Netflix pages document the titles and premises; availability can differ by country.