Park Hae-soo
Kim Je-hyeok (16 eps)
Jung Kyung-ho
Lee Jun-ho (16 eps)
Krystal Jung
Ji-ho (16 eps)
Lee Kyoo-hyung
Looney (16 eps)
Choi Moo-seong
Min-cheol (16 eps)
Jeong Min-sung
Dr. Ko (16 eps)
Park Ho-san
KAIST (16 eps)
Kang Seung-yoon
Jean Valjean (16 eps)
Jung Woong-in
Lieutenant Paeng (16 eps)
Jung Hae-in
Captain Yoo (16 eps)
Kim Sung-cheol
Jailbird (16 eps)
Im Hwa-young
Kim Je-hee (16 eps)
Kang Ki-doong
Officer Song (16 eps)
Choi Seong-won
Mole Boy (16 eps)
Sung Dong-il
Chief Jo (16 eps)
Kim Kyung-nam
Lee Joon-dol (16 eps)
Jung Moon-sung
Captain Yoo's Brother (16 eps)
Yeom Hye-ran
Han Yang's mother (5 eps)
Lee Do-hyun
Young Lee Jun‑ho (3 eps)
Shin Dong Hoon
Reporter (1 eps)
Kim Joong-ki
Minister of Justice's aide (1 eps)