Guest Stars Go Dong Eob as Crime Scene Investigator Park Jung Pyo as Hong Eun Pyo Lee Dong Yong as Captain Kim Jung Woo as Detective Hwang Bae Jin as Detective Won Mi Won as Min Hey Jin's mother Choi Hyung Joo as Park Eun Yul Kim Si Ha as Park Ha Yul Kim Kyu Baek as Joo Myung Hoon Lee So E as Cafe's Customer