Jae Hee started out his acting career as a child actor in the 1997 MBC series Mountain. In 2004, he starred in the romantic drama film 3-Iron, opposite Lee Seung-yeon. His performance in the movie won him Best New Actor at the 25th Blue Dragon Film Awards. In 2005, he was paired with Han Chae-young in the hit KBS2 romantic comedy series Delightful Girl Chun-hyang, which earned him the Best New Actor trophy at the KBS Drama Awards. In 2007 and 2008, he worked with Han Ga-in and Eugene in SBS’ Witch Amusement and KBS2’s Three Dads, One Mom, respectively. In 2012, he took home an Excellence Award at the MBC Drama Awards for his performance in May Queen. In 2019, he joined Lee So-yeon and Jo Ahn in MBC’s Blessing of the Sea, in which he received a Top Excellence nomination at the MBC Drama Awards.

Jae Hee enlisted for his mandatory military service in August 2008 and was discharged in June 2010. In 2012, it was revealed that the actor has been married since 2010 and has a son with his wife.