유해진
— Gui-bo
Kim Min-jae
— Sung-woong
Lee Sung-kyung
— Ga-young
Sung Dong-il
— Sung-soo
Jin Kyung
— Mi-ra
Na Moon-hee
— Gui-bo's Mother
황우슬혜
— Do-na
Park Gyu-young
— So-young
Lee Han-seo
— Ji-young
Kim Tae-hoon
— Seung-hyuk
Hyun Bong-shik
— Coach
김강현
Koh Soo-hee
최유화
— Hye-jung
Lee Ji-ha
명석근
Lee Ye-won
— Ga-young (young)
김태윤
— Gym member