Shim Kyu-hyuck
Park Hyung Seok (Small) (voice) (8 eps)
Han Shin
Park Hyung Seok (Big) (voice) (8 eps)
Ryu Seung-gone
Lee Jin Seong / Park Jong Gun (voice) (8 eps)
Jeong Jae-heon
Vasco / CEO / Lee Nam Su (voice) (8 eps)
Nam Doh-hyeong
Jin Ho Bin / Jang Gi Seok / Kim Mae Sik / Park Bum Jae (voice) (8 eps)
Hwang Chang-yung
Pyun Deok Hwa / Lee Tae Sung / Oira (voice) (8 eps)
Sa Moon-young
Park Ha Neul / Female Student / Female Extra (voice) (8 eps)
Lee Kyung Tae
Park Ji Ho (voice) (8 eps)
Kim Hyeon-uk
Lee Hyun Do / Go Jeong Gi / Kim Seul Bum (voice) (8 eps)
Lee Gyu-chang
Na Yu Eop / Park Han Gyul / Homeroom Teacher (voice) (8 eps)
Bae Jeong-mi
Choi Soo Jeong / Deok Hwa's Grandmother / Female Student (voice) (8 eps)
Kim Ok-kyung
Hyung Seok's Mom (voice) (8 eps)