Yoona as Seon-ji

Ahn Bo-hyun as Gil-gu

Sung Dong-il as Jang-su

Joo Hyun-young as Ah-ra

Shin Hyun-soo as Yeong-sik

Ko Gun-han as Hee-bum

Han Jae-ah as Main body of Moon-yang

Song Duk-ho as Young Jang-su

Park Eun-jin as Seon-ji's mother

Jung Ji-woo as Seon-ji's maternal great-grandmother

Lee Si-rae as Seon-ji's maternal great-grandfather

Na Gyeong-sook as Seon-ji's maternal great-grandmother's mother-in-law

Lee Hyo-bi as 8-year-old Seon-ji

Kim Ye-na as 15-year-old Seon-ji

Kim Eun-soo as Convenience Store Part-timer

Baek Seung-chul as Middle-aged male patient