After winning a KBS Drama Award for his portrayal of Han Jae-kwang in the television movie Just An Ordinary Love Story, Woo-jin earned an MBC Drama Award nomination for his performance in the series Arang and the Magistrate.
In his first film, Just Friends?, he is credited as Seo Ji-hoo.
He and Song Seung-heon were both in the cast of the 2013 MBC series When a Man Falls in Love.
Before beginning his acting career, he studied engineering at Sejong University and worked as a fashion model.
Born Kim Bong-hee, he grew up in Gangneung, Gangwon-do, South Korea.