Gong Chang-ho (14 episodes)

Father Marco

Jung Guk-hwan

Lee Cheol Yong [Elder] (16 episodes)

Kim Byeong Gil [Concubine Kim's father] (10 episodes)

Hong Il-kyung (3 episodes)

Moon Chul Sung (8 episodes)

Kang Hui Ryong [Chief of police] (20 episodes)

Seo Min-soo

Choi Nam Hyeon [Taxi driver] (1 episode)

Jun-taek's father (3 episodes)

Chief Song

Cha Jin-cheol (14 episodes)

Byun Jong-il (16 episodes)

Kim Pil Soo [Chairman] (16 episodes)

Joo Seong-hak (4 episodes)

Lee Jang-won (12 episodes)

King Go Soon (30 episodes)

Kim Seok-Hoon (16 episodes)

Im In-gwan (12 episodes)

Hong Eun O [Cheon Ki's father] (16 episodes)

Hwang Jeong Ho (16 episodes)

(1 episode)

Shin Myeong-hwi (16 episodes)

Sunwoo Myung (16 episodes)

Doctor

Chun Suk Tae [Chun Jong Bum's father] (32 episodes)

Kwon Joo Han [Managing Director, Taesung Group] (32 episodes)

Kim Hyung Soo (32 episodes)

Choi Gwang Min [Chief of FSC's Audit and Inspection office] (1 episode)

President

Park Man-young (16 episodes)

Mo Sung Kook [TL Osem Head of Department] (32 episodes)

Choi Pil Soo [Do Hyun's father] (16 episodes)

Ahn Chang Hoon (40 episodes)

Lee Ki Baek [Section chief] (4 episodes)

Pub owner (2 episodes)

Jang Ming Gi (16 episodes)

Director Nam Chul Woo (16 episodes)

Hyun-su's Father

Ahn Yoo (uncredited)

[Death Row Inmate - Detention Center] (2 episodes)

Han Seo

Han Seo (1 episode)

Attorney Choi

Doctor

[Friend 2]

Doo-chan

Jeong-woo