Bae Yong-joon
Bae Yong-joon also became the part of cast for first four episodes making his first small screen appearance in three years. While Park Jin-young marked his acting debut with the series. Ok Taec-yeon and Jang Wooyoung from 2PM, Bae Suzy from Miss A, Hahm Eun-jung from T-ara, singer IU and Kim Soo-hyun were selected for the main cast. Kim was the only non-idol among the cast; he studied music and dance at JYP Entertainment for 3 months in order to portray his role.