Kim Sang-ho (actor)

Pung-san

Kim Seok-tae, he is a loving father and a prosperous medical equipment businessman, but he strictly discipline Ui-gyeom to become a doctor.

Pyo Bak-ho

Kim Sang-geun

Han Jung-soo

Baek Min-yeop

Kim Sin-gu

Park Cheol-won

Park Sang-goo: director of the department.

Shin Chi-sik, owner of Mokgol Dumplings.

Cha Yoo-gon, a witty police science professor who as a police officer had run wild in the past without fear of the world before an incident changed his outlook on life.

Park Jae-kyung

Director (Ep. 12)

Mok Jin-hyung, the chief prosecutor of Northern District Prosecutors' Office.

Cha Gi-ho

Yoon Sang-ho

Choi Jin-hwan

Han Du-sik, Hyun-su's disabled neighbor and a skilled blacksmith who supplies the residents with weapons and defenses.

Go Hyeon-seok

Mu-yeong (seasons 1–2), Prince Chang's loyal personal bodyguard who accompanies him to the southern provinces to investigate the plague, leaving his pregnant wife in the capital.

Choi Deok-gi

Hwang Jae-guk

Oh Kwang-ho

Jo Sang-won

Monk Myung-cheol

Won Dae-hae

Choi Il-sub

Yang Jeong-han

Bae Man-duk / Bae Shik-joong

Park Joong-hyuk

Bae Man-duk / Bae Shik-joong

Na Joong-seok, Chief Prosecutor

Coach Nam

Ma-hwang