조승연

Seong Hyeon-guk

Yoon Jeong-ki

Homeroom teacher

Apt. 702 Resident

Seong In-jae

dean of academic affairs (Yu-seong Tech)

Wu Cheol-yong

Chun Soo-beom

Choi Han

Kwak Se-hwan

Kim Unbu

Kyeong Geun-jik

Jin Chul-joong

Bae PD / Bae Cheol-ho

Jo Wan-gyu

Golf club member / Airplane passenger

Lee Byeok

Oh Hyun-chul

Yoo Jeong-ryeol

Ju Jeon

King Sun-Jo

No Young-Seok

Police Station Section Head Chief

Prosecutor Choi

Detective Jo

Assistant General Prosecutor Kim Geun-Soo

Detective Jo

Min Young-hwan

Dong Ja-seung's Father