In 2001, the year he turned 20, he debuted as the rapper of the five-member dance group LEO. In 2003, he says, he appeared as an extra in KBS2’s Sang Doo! Let’s Go to School. In 2004, he played a supporting role in the sitcom Among Agasshi and Ajumma.
The breakthrough yearIn 2007, the year he turned 26, he played Kang Baek-ho in KBS1’s daily drama Likeable or Not. Newsen writes that this drama made his name known to the public. It was six years after his debut.
In 2008, Likeable or Not ended, and he went straight into ski-jump training for the film Take Off. In 2009, the film Take Off opened. In 2010, he played Wang-son-i in KBS2’s The Slave Hunters, and in May he enlisted for active duty. In 2012, after his discharge in March, he appeared in tvN’s I Need Romance 2012. In 2013, he appeared with Jung So-min in a KBS2 one-act drama.
In 2015, he appeared from the first broadcast of tvN’s Hot Brain: Problematic Men. In 2024, Dong-A Ilbo wrote that he made his name known with this variety show. In 2016, he appeared as Lee Jin-sang in Another Miss Oh.
In 2017, he appeared in MBC’s Children of the 20th Century, and that year shared the best actor in a Monday-Tuesday drama award at the MBC Drama Awards with Jo Jung-suk of Two Cops. In 2018, he played Yoo Baek in Top Star U-back.
In 2019, he appeared as Kang Jong-ryul in When the Camellia Blooms and won the excellence award for actor in a mid-length drama at the KBS Drama Awards. In 2020, on JTBC’s The Romance, he made the web drama Timing with Yoo In-young. In 2021, he played Yoo Ja-sung in JTBC’s Monthly Magazine Home.
In 2023, he played Oh Seung-yoon, a company commander, in ENA’s New Recruit 2. In 2024, he co-hosted ENA’s Hyunmoo Kase with Jun Hyun-moo, and in August announced a relationship with the actress Lee Ju-myoung. In December 2025, he posted a photo of a reunion with the Problematic Men cast.
In 2026, he appeared in the Netflix film Husbands in Action, and KBS Drama’s OK! Let’s Get Divorced began in August and ended with its finale on Sept. 24.
Kim Ji-seok (born Apr 21, 1981) debuted in 2001, the year he turned 20, with the group LEO, and became known as Kang Baek-ho in KBS1’s Likeable or Not, which began on Sep 3, 2007, the year he turned 26. In 2015, the year he turned 34, he appeared on tvN’s Hot Brain: Problematic Men.
Ages are by calendar year (the year minus the birth year), birthdays aside.