Guest Stars Seo Yi Ra as Sgt. Oh Soo Hyun Yoon Sa Bong as Unit Chief Jeong Yeon Joo Lee Kang Wook as Jung Yoon Ho Kim Min Ju as Oh Yoon Jin (High School) Park Jung Pyo as Insp. Yoo Kyung Hwan Cho Han Gyeol as Jang Jae Kyung (High School) Seo Sang Won as Police Chief Bae Byung Ho Yoo Hee Je as Gong Jin Wook
