Ryoo Seung-wan Director, Screenwriter, Producer Ahn Kil-kang Oh Wang-jae Actor Jeong Seok-yong Yoo Dong-hwan Actor Cho Deokhyeon Boss Jo Actor Jung Doo-hong Tae-su Actor Kim Byeong-ok Youth president Actor Lee Beom-soo Pil-ho Actor Lee Ju-shil Yoo Suk-hwan's mother Actor Kim Jeong-min Screenwriter, Producer Lee Won-jae Screenwriter Bang Junseok Original Music Kim Yeong-cheol Cinematographer