Before she was taking down school bullies on Netflix, Jin Ki-joo was clocking in at a Samsung SDS office. The 37-year-old is now the face of hit K-drama Teach You a Lesson, and global viewers are suddenly asking who she is and how she got here.
Her path could not be further from the usual trainee-to-star pipeline. Jin moved from computer engineering to a corporate IT job, then an exhausting stint as a local TV reporter and a supermodel contest run, before landing the role of Im Han-rim, the only female inspector in Teach You a Lesson’s brutal education task force.
Jin Ki-joo in Teach You a Lesson: Why She Is Everywhere
Released globally on Netflix on June 5, 2026, Teach You a Lesson is a 10-episode action school drama adapted from the webtoon Get Schooled. It follows a government task force, the Educational Rights Protection Bureau, that cracks down on school violence and collapsing teacher authority.
The series exploded out of the gate. It topped Netflix’s Global Top 10 non-English TV chart for two weeks, reached the Top 10 in over 90 countries and No. 1 in 46, and logged one of the strongest Korean buzz scores of 2026 with Good Data.
Jin plays Im Han-rim, a former Special Forces sergeant turned inspector who storms classrooms and gym halls alongside Na Hwa-jin and Education Minister Choi Gang-seok. As viewers binge, searches for “Jin Ki-joo Teach You a Lesson” are soaring for this unexpectedly tough heroine.
From Samsung Office Cubicle to Drama Set
Off screen, Jin’s resume looks nothing like a typical actress. She studied computer engineering at Chung-Ang University, then spent about three years at Samsung SDS as an IT consultant and in-house model, following what she once called a safe, formulaic path.
Her mother intervened after noticing how unhappy she looked, urging her to “do what you really want to do.” Jin quit at 26, became a trainee reporter at G1 Broadcasting in Gangwon, and soon found herself on overnight police and ER beats, so exhausted she later admitted she would vomit while washing her hair.
After only three months she walked away again, clashing with her journalist father, who told her to leave home and said she was “not my daughter anymore.” Months later she entered the 2014 SBS Supermodel Contest, finished third out of roughly 2,600 entrants, secured an agency, then started stacking drama roles before breaking out in the indie film Little Forest, which earned her a best new actress award at the Chunsa Film Art Awards.
Rewriting the K-drama Female Lead Rules
Those steady choices led to prestige TV like political drama Uncle Samsik on Disney+ and action-comedy Undercover High School, then finally to Teach You a Lesson. Jin once said her past careers were “different pieces” that eventually “completed the puzzle” of her life.
As Im Han-rim, an ex-soldier who fights on the front lines of a collapsing school system, she broadens what a K-drama heroine can be in a story about school violence and teachers’ rights. Next, she is set to lead a 2027 KBS romantic comedy with Kim Sung-cheol, proof that this late-blooming lead is just getting started.