[2] He is known for starring in the films Guns & Talks (2001), Silmido (2003), Someone Special (2004), Welcome to Dongmakgol (2005), Public Enemy Returns (2008), Castaway on the Moon (2009), Moss (2010), and Confession of Murder (2012), as well as the television series Partners for Justice (2018–19).

"[3][4] Jung Jae-young started his career taking minor roles in films ranging from his debut The Adventures of Mrs. Park to Green Fish (1997), The Quiet Family (1998), and Die Bad (2000).

[5][6] For his performance as a war-weary North Korean officer who befriends his counterparts from the South, Jung won Best Actor at Director's Cut Awards.

From 2005 to 2009, Jung played a string of various roles; from a shy rural farmer who travels to Uzbekistan in the hopes of finding a wife in Wedding Campaign,[7] a betrayed gangster in Righteous Ties, a cop during a bank robbery drill gone awry in Going by the Book, a CEO under investigation in Public Enemy Returns, to a Joseon merchant who gets drawn into plans for developing a rocket against the Ming Dynasty in The Divine Weapon, and a suicidal man who finds himself washed up and stranded on an uninhabited island in Castaway on the Moon.

The following year, Jung was cast as a fading baseball star who is forced to coach a team of hearing-impaired kids in GLove,[12] and a cold-hearted debt collector who needs a transplant in Countdown.

[13] Jung returned in 2014 as a detective facing off against a bestselling novelist who makes a Confession of Murder,[14][15] an obsessive-compulsive who falls for a carefree musician in rom-com The Plan Man,[16] a father tracking down his daughter's killers in Broken,[17][18] and an undercover assassin who tries to protect King Jeongjo in a period drama The Fatal Encounter.