CHARACTERS LEE MIN HO as Kim Tan PARK SHIN HYE as Cha Eun Sang KIM WOO BIN as Choi Young Do KRYSTAL as Lee Bo Na CHOI JIN HYUK as Kim Won KANG MIN HYUK as Yoon Chan Young KANG HA NEUL as Lee Hyo Shin PARK HYUNG SIK as Jo Myung Soo IM JOO EUN as Teacher Jeon Hyun Joo KIM JI WON as Rachel Yoo