Seo Ha Joon, birth name Son Jong Su, is a South Korean actor managed by BLESS entertainment. He debuted in 2008 with the theatre play "Dead Poets Society". He appeared in music videos in 2012, with the artist Half a hundred, with the song "24Billy", and in 2013, with artist Jo Kwan-woo with the song, "fire". He also sang OSTs in 2013 for the drama, Princess Aurora [OST Part 3 - I Want to Live: Oh Chang-seok, Seo Ha-jun], and in 2015 for the drama, Goodbye and Hello [OST - Goodbye and Hello]. (Source: Wikipedia) Watch drama online for free.