Yoo Hae-jin (Korean: 유해진; born January 4, 1970) is a South Korean actor. After graduating with a Theater degree from Seoul Institute of the Arts, he became a member of Theater troupe The Mokwha Repertoire Company. He has established himself as one of the top actors in the country, playing both supporting and lead roles.

As a child, Yoo would often slip in through the backdoor of a cultural center near his home to watch events that were being held there. After seeing a play in eighth grade, the teenager decided on acting as his future career. He begged to be sent to an arts high school, but his family was conservative and not financially capable. So in his junior year in high school, Yoo joined an acting troupe. In the beginning, he ran errands for the other actors and tried to copy what they did from a distance. Though introverted, Yoo slowly began to learn how to act on stage. After applying twice for a Theater and Film course in college and getting rejected because of his looks, Yoo majored in Fashion Design instead. But acting remained his passion and he concentrated on his theater work rather than his fashion subjects, barely graduating. Due to a special selection process for college graduates based solely on their grades, Yoo was finally accepted to the theater department of the Seoul Institute of the Arts.^[1][2][3]

Yoo then began doing bit roles in films, graduating to supporting roles where he acquired a reputation as a scene stealer. Despite a short screen time, his performances made a strong impression on audiences and critics. As Korean films became more diverse in terms of genre, Yoo found opportunities in increasingly weighty roles, and now has become a bonafide marquee name in the box office.^[4] He has since established himself as one of the top character actors in the country, notably in King and the Clown, Small Town Rivals, Jeon Woo-chi: The Taoist Wizard, Moss, The Unjust, The Pirates, The Classified File, Minority Opinion, Veteran, and Public Enemy and its sequels.^[5][6]

Yoo also began to take up lead roles. His first lead starring film, Luck Key, was released in 2016 and surpassed 5 million viewers.^[7][8] 2017 was a successful year for Yoo - he had co-lead in Confidential Assignment,^[9] and had supporting roles in A Taxi Driver and 1987: When the Day Comes.^[10] All three were among the highest grossing Korean films of that year. In addition, A Taxi Driver earned him a Best Supporting Actor award at the Korean Association of Film Critics Awards and a nomination at the Asian Film Awards. In 2018, he starred in family comedy Love+Sling,^[11][12] and Intimate Strangers, a remake of the Italian comedy film Perfect Strangers.^[13] That year, he also was cast in the historical war film The Battle: Roar to Victory.^[14] He reprised his role in Confidential Assignment 2: International, which was the third highest grossing Korean film in 2022.^[15]

He has also appeared as a regular cast member in two reality shows: 2 Days & 1 Night from March to November 2013,^[16][17][18] and Three Meals a Day: Fishing Village in January 2015.^[19][20]

In November 2023, Yoo signed with new agency Awesome ENT.^[21]

Yoo and actress Kim Hye-soo first met in 2001 after shooting the movie Kick the Moon and became close in 2006 after appearing together in Tazza: The High Rollers. Rumors of the two dating surfaced starting 2008 although both continuously denied any romantic involvement until early 2010 when paparazzi photographs of the two were released,^[22][23] and the couple officially confirmed their relationship.^{[24][25][26][27][28]} Yoo and Kim broke up in 2011.^[29][30][31]