Op-pa saeng-gak Online

Si-wan Yim - Second Lieutenant Han Sang-yeok (as Si-wan Im) , Ko Asung - Park Joo-mi (as Ah-sung Ko) , Hee-joon Lee - Galgori (Hook), Daniel Joey Albright - Club Soldier 1 Gareth Fannin - UN Staff 2 (as Fannin Gareth James) , Lee Ho-Cheol - Radio Operator, Kang Hyun-Goo - Hook Kid 1 Jang Joon-Hee - North Korean Army Officer, Lee Joon-hyuk - Master Sergeant Jo, Tang Joon-Sang - Lee Seo-Jin, Joon Won Jung - Dong-Goo, Lee Jung-Hyun - North Korean People's Army, Hyun-Bin Kim - Il-Hwan, Min-seo Kim - Joo-Won (Choir) (as Kim Min-Seo) , Yeong-jae Kim - Dong-Goo's father