as Yoon Jeong-ki

as Apt. 702 Resident

as Wu Cheol-yong

as dean of academic affairs (Yu-seong Tech)

as Seong In-jae

as Homeroom teacher

as Choi Han

as Chun Soo-beom

as Kwak Se-hwan

as Kyeong Geun-jik

as Kim Unbu

as Golf club member / Airplane passenger

as Jin Chul-joong

as Bae PD / Bae Cheol-ho

as Jo Wan-gyu

as Lee Byeok

as Oh Hyun-chul

as Ju Jeon

as Yoo Jeong-ryeol

as Police Station Section Head Chief

as King Sun-Jo

as No Young-Seok

as Detective Jo

as Assistant General Prosecutor Kim Geun-Soo

as Min Young-hwan

as Dong Ja-seung's Father

as Park Yoon-Ho's father

as Grocery store clerk

as Jae-hyeok

as Special Investigation Team