Ryu Jun-yeol Sung Min-chan Shin Hyun-been Lee Yeon-hui Shin Min-jae Kwon Yang-rae Han Ji-hyun Lee Yeon-ju Kim Bo-min Shin A-yeong Kim Do-young Lee Nak-seong Moon Joo-yeon Lee Si-yeong Bae Yoon-gyu So Eun-gyu Oh Chi-woon Violent Crimes Captain Woo Kang-min Violent Crimes Unit Chief Jeon Woon-jong Detective 1 Lee Han-sol Detective 2 Joo In-young A-yeong's Mother Kim Moon-hak A-yeong's Father Choi Gwang-il Jung Guk-hwan Lee Se-ho Jung Hwan-su Do Yong-gu Yeon-hui's Father