Who Are The Main Actors In My Younger Boss?

I just finished rewatching 'My Younger Boss' for the third time, and the cast is honestly one of its biggest strengths! The chemistry between the leads is electric—especially Park Seo-joon, who plays the charismatic but slightly chaotic younger boss with this perfect mix of arrogance and vulnerability. His comedic timing is golden, especially in scenes where he’s trying to assert authority while secretly panicking. Then there’s Kim Da-mi as the no-nonsense employee who slowly melts his ego; her deadpan expressions kill me every time. The supporting cast shines too, like Lee Byung-hun as the eccentric CEO who steals every scene he’s in. It’s one of those rare shows where even minor characters feel fully fleshed out, like the gossipy office mates or the rival boss played by Yoo Jae-myung. The actors all bring such distinct energy that the workplace dynamics feel hilariously real.

What I love most is how the cast balances humor with heartfelt moments. Park Seo-joon’s subtle shifts from cocky to insecure make his character deeply relatable, and Kim Da-mi’s quiet strength avoids the 'manic pixie dream girl' trope. Even the romantic subplot with the café owner (played by Jung Hae-in) adds warmth without overshadowing the main storyline. The actors’ Instagram BTS posts show how much fun they had filming, which totally translates on screen. If you haven’t seen it yet, binge it for the performances alone—they turn a typical office rom-com into something special.