Cho Seung-yeon

as Apt. 702 Resident

as Golf club member / Airplane passenger

as Lee Byeok

as Lee Chun-bo

as Detective Jo

as Detective Jo

as Min Young-hwan

as Dong Ja-seung's Father

as Male Student Protester

as Grocery store clerk

as Jae-hyeok

as Special Investigation Team

as Seong Hyeon-guk • 5 eps

as Yoon Jeong-ki • 12 eps

as Homeroom teacher • 1 eps

as Seong In-jae • 12 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 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 Prosecutor Choi • 1 eps

as Assistant General Prosecutor Kim Geun-Soo • 1 eps

as Park Yoon-Ho's father • 1 eps