Jeon No-min

Dan Chi-gang / Nobleman Kim

Hwang Chung-seong: a former brigadier general of the security forces and the current deputy director of the Agency for National Security Planning.

Kim Myung-jae

Choi In-guk

Kim Seung-woon

Park Hae-ryun, Si-eun's husband, a professor of Department of Theater.

Captain Choi Gi-taek (Ep. 4 & 6)

Kang I-soo, hospital's chairman and Shi-young's father.

Shin Myung-joon

Oh Byung-wook (ep. 7)

Cha Jung-tae

Choi Jae-sung, Do-kyung's father. He and Myung-hee were university sweethearts and he married her even after finding out about her background as a chaebol heiress. Although he works for his in-laws' company, he feels suffocated and despises the cold mannerisms and lack of personal relationships between his in-laws.

Mo Joong-hun

Lee Joon-suk

Lee Chan-moo

Hong In-bang

Gook Yoo, Gook In-yeob's father

Kang Tae-joong

Bae Chan-sik

Choe Myeong-gil (based on de Tréville)

Kim Jeong-do (ep. 1-2)

Park Jung-woo

Choi Soo-ho

Mok Damsari (Mok-dan's father and the General of the Independence Army)

Kim Jung-wook

Jung Seon-gyu

Seo Young-wook

Mok In-beom

Uhm Ki-do

Sung-choong

Jeong Do-kwang

Seolwon

Ha Soo-young (eldest grandson, works at Ha Corporation)

Min Seung-guk (민승국), historiographer of Ch'unch'ugwan

Kim Tae-hyun