Kadro (12)
Shim Kyu-hyuckPark Hyung Seok (Small) (voice)
Han ShinPark Hyung Seok (Big) (voice)
Ryu Seung-goneLee Jin Seong / Park Jong Gun (voice)
Jeong Jae-heonVasco / CEO / Lee Nam Su (voice)
Nam Doh-hyeongJin Ho Bin / Jang Gi Seok / Kim Mae Sik / Park Bum Jae (voice)
Hwang Chang-yungPyun Deok Hwa / Lee Tae Sung / Oira (voice)
Sa Moon-youngPark Ha Neul / Female Student / Female Extra (voice)Lee Kyung TaePark Ji Ho (voice)
Kim Hyeon-ukLee Hyun Do / Go Jeong Gi / Kim Seul Bum (voice)
Lee Gyu-changNa Yu Eop / Park Han Gyul / Homeroom Teacher (voice)
Bae Jeong-miChoi Soo Jeong / Deok Hwa's Grandmother / Female Student (voice)Kim Ok-kyungHyung Seok's Mom (voice)