Main Characters Sung Dong Il 12 main appearances Kim Hee Won 12 main appearances Yeo Jin Goo 12 main appearances
Recurring Guest Characters Gong Hyo Jin 3 guest appearances Ra Mi Ran 2 guest appearances Hyeri 2 guest appearances Lee Sung Kyung 2 guest appearances Lee Joon Hyuk 2 guest appearances IU 2 guest appearances P.O 2 guest appearances Ha Ji Won 2 guest appearances Uhm Tae Goo 1 guest appearances Lee Jung Eun 1 guest appearances Go Chang Suk 1 guest appearances Park Hyuk Kwon 1 guest appearances Jung Eun Ji 1 guest appearances