Hong Jong-hyun
— Min Ho-soo
박지연
— Seo Yool
Lee Joon
— Ahn Ba-woo
Han Ji Woo
— Baek Hyo-ahn
신소율
— Lee Ra-yi
김보라
— Yoon Gong-ji
Choi Myung-kyung
— Lee Sang-yong
Lee Mi-so
— Yoo Yeo-jin
Yoon Hee-seok
— Jung In-woo
Kim Dong-beom
— Bae Tae-rang
Jung Woo-yeon
— Jeong Yoo-mi
고경표
— Bong Il-tae
정경호
— Min Chan-ki
Choi Woo-hyeok
— Speaker
Nam Hyun-joo
— Ho-soo’s mother
Man-Sik Jeong
— Ba-woo’s father
전소민
— Ba-woo’s date
Lee Il-hwa
— Ra-yi’s mother
Jo Jae-yun
— P.E. teacher
Song Eun-jin
— Teacher