Lee Jae-jin (Hangul: 이재진; Hanja: 李在真; Japanese:イ•ジェジン born December 17, 1991) is a South Korean musician and actor. He is a member of rock band F.T. Island, where he serves as the bassist and 2nd vocalist. Lee has also contributed to F.T. Island’s body of work with several compositions of his own.
Lee made his acting debut in the 2007 KBS2 sitcom Unstoppable Marriage. He was a main cast member while the other members made a cameo appearance.
In 2009 Lee was cast for the main role in the musical Sonagi, which is based on the classic Korean short story “Sonagi” written by Hwang Sun-won. He got the role as a young boy.