All Cast
Park Jeong-min
Hak-soo
Kim Go-eun
Sun-mi
Jang Hang-seon
Hak-soo's Father
Go Joon
Yong-dae
Shin Hyun-been
Mi-kyung
Jeong Gyu-su
Sun-mi's Father
Kim Jun-han
Won-joon
Jeong Seon-cheol
Joong-sik
Bae Je-gi
Sang-ryul
Lee Jung-hyun
Alumni
Shin Mun-sung
Police Officer
Im Sung-jae
Hak-gi
Bek Hyun-jin
Bang-baek
Kim Se-gyeom
Patient
Bae Young-ran
Hye-ok
Choi Jung-hun
Goo-bok
Yoo Young-bin
Rapper
Song Duk-ho
Rapper
Lee Seung-hun
Gold Medal
Park Soo-yeon
Student
Jo Ha-seok
Teacher