Oh Jung-se (; born February 26, 1977) is a South Korean actor. He is best known for his lead roles in the television series It's Okay to Not Be Okay (2020), Uncle (2021), Revenant (2023), Mr. Plankton (2024), and Good Boy (2025), as well as the film Swing Kids (2018) and Hi-Five (2025). He won Best Supporting Actor â Television at the Baeksang Arts Awards for two consecutive years in 2020 and 2021.
Oh Jung-se was born on February 26, 1977. He has been active in the entertainment industry since his debut in the 1997 film Father. He has appeared in various works, including plays, movies, dramas, and music videos. Despite mostly playing minor and supporting roles, he has gained popularity as a "scene stealer" in movies such as Introducing My Girlfriend, Ghosts Live, You Are My Destiny, Love, That Unbearable Lightness, Our Happy Time, Mudori, Dungfly, Bangjajeon, and Cheap Romance.He appeared in the 2010 film Unjust, directed by Ryoo Seung-wan, where he played a corrupt reporter who accepts entertainment and bribes from prosecutors and writes articles to suit his taste. In 2012, Oh gained popularity portraying the character of Lee Seung-jae, a Hallyu top star, in the film Man's Manual alongside Lee Si-young. Two years later, he appeared in the 2014 film Tazza: God's Hand, where he played the cold villain Chief Seo.
In 2017, Oh became popular and gained critical praise for his portrayal of Min Cheon-sang, a lawyer on the brink of madness in the film Fabricated City. In 2019, Oh gained critical praise for his portrayal of Ted Chiang, the leader of a drug organization, in the film Extreme Job. That year, Oh also appeared in the television series When the Camellia Blooms as Noh Gyu-tae and Hot Stove League as Kwon Kyung-min. For the roles, he won the 2019 KBS Drama Awards for Best Supporting Actor and Best Couple in the mid-length drama category, the 2020 Baeksang Arts Award for Male Supporting Actor in the television category, and the Best Character Award at the SBS Drama Awards.
Oh played the character of Moon Sang-tae, an artistic genius with autism, in the tvN television series It's Okay to Not be Okay. His portrayal earned him favorable reviews from the audience and the Baeksang Arts Award for Male Supporting Actor in the television category.
In 2023, Oh Jung-se demonstrated his versatility by playing two contrasting roles. Oh starred alongside Kim Tae-ri and Hong Kyung in the SBS occult thriller Revenant, where he portrayed Yeom Hae-sang, a stoic folklore professor gifted with the supernatural ability. He also starred in Kim Jee-woon's film Cobweb as Kang Ho-se, a flamboyant and popular playboy actor serving as the movie Cobweb male protagonist. For the latter, Oh received a best supporting actor nominations at the 44th Blue Dragon Film Awards and won at the 59th Grand Bell Awards.
In Netflix original series Mr. Plankton, Oh acted as Eo Heungo, the son of the 500-year-old ancient Eo clan's main family.
In 2025, Oh starred in one film and four dramas. He made a special appearance in Lim Sang-choon's drama When Life Gives You Tangerines, as Yeom Byeong-chul, Ae-soon's stepfather. In May 2025, Oh starred in the Shim Na-yeon-directed action-comedy series Good Boy alongside Park Bo-gum.
Oh and his wife met in elementary school and married after 19 years of dating. They have two children.
In 2020, Oh revealed in a television show that he suffers of prosopagnosia.