as Na Man-seok(12 eps)
as Yongchul
as Seong Hyeon-guk(5 eps)
as Yoon Jeong-ki(12 eps)
as Homeroom teacher(1 ep)
as Apt. 702 Resident
as Seong In-jae(12 eps)
as Kang Il-chan(4 eps)
as dean of academic affairs (Yu-seong Tech)(10 eps)
as Wu Cheol-yong(12 eps)
as Chun Soo-beom(12 eps)
as Choi Han(2 eps)
as Kwak Se-hwan(16 eps)
as Kim Unbu(32 eps)
as Kyeong Geun-jik(21 eps)
as Jin Chul-joong(24 eps)
as Bae PD / Bae Cheol-ho(16 eps)
as Jo Wan-gyu(12 eps)
as Golf club member / Airplane passenger
as Lee Byeok
as Oh Hyun-chul(16 eps)
as Yoo Jeong-ryeol(16 eps)
as Ju Jeon(24 eps)
as King Sun-Jo(16 eps)
as No Young-Seok(40 eps)
as Police Station Section Head Chief(16 eps)
as Lee Chun-bo
as Prosecutor Choi(1 ep)
as Detective Jo
as Assistant General Prosecutor Kim Geun-Soo(1 ep)
as Detective Jo
as Min Young-hwan
as Dong Ja-seung's Father
as Park Yoon-Ho's father(1 ep)
as Male Student Protester
as Grocery store clerk
as Jae-hyeok
as Special Investigation Team