Im Jungwhan (as Seong-guk Choi)
Eun-ju
Jung-Hwan's father (as Il-seob Baek)
Jung-Hwan's mom (as Won-suk Park)
Hwang Kye-Jang
Chil-Goo (as Sang-ki Jo)
Nanny
Doo-Sik (as Won-jong Lee)
Ma Sung-Sook
Ma Sung-Ki
Female Student (as Si-yeon Jeong)
Keunson gang member