Yoona
— Seon-ji
Ahn Bo-hyun
— Gil-gu
Sung Dong-il
— Jang-su
주현영
— Ah-ra
신현수
— Yeong-sik
Go Geon-han
— Hee-bum
한재아
— Main body of Moon-yang
송덕호
— Young Jang-su
박은진
— Seon-ji's Mother
정지우
— Seon-ji's Maternal Great-grandmother
이시래
— Seon-ji's Maternal Great-grandfather
나경숙
— Seon-ji's Maternal Great-grandmother's Mother-in-Law
이효비
— 8-year-old Seon-ji
김예나
— 15-year-old Seon-ji
김은수
— Convenience Store Part-timer
백승철
— Middle-aged Male Patient