류준열 Sung Min-chan 신현빈 Lee Yeon-hui 신민재 Kwon Yang-rae 한지현 Lee Yeon-ju Kim Bo-min Shin A-yeong Kim Do-young Lee Nak-seong Moon Joo-yeon Lee Si-yeong 배윤규 So Eun-gyu Oh Chi-woon Violent Crimes Captain Woo Kang-min Violent Crimes Unit Chief 전운종 Detective 1 이한솔 Detective 2 주인영 A-yeong's Mother Kim Moon-hak A-yeong's Father 최광일 Jung Guk-hwan