Known as Hero Jaejoon, he is a South Korean pop singer who performs with the boy bands JYJ and TVXQ.
He found television success in Dr. Jin and Protect the Boss.
He rose to fame as a member of a South Korean boy band, as did Shinee's Jonghyun Kim.
He left home to pursue a career as an entertainer at age fifteen.
He has been romantically linked to pop singer and actress Sandara Park.