Jung Woong-in

Jung Doo-man

Oh Tae-soo: a former prosecutor and member of the National Assembly.

Seok Chul-hwan

Kang Seok-joo

Right State Councillor Cho Won-bo

Koh Jong-yul, Hansu's father.

A second generation chaebol

Jang Won-seok

Ma Jin-woo.

Jang Yoon-seok

Hong In-pyo

Oh Won-sik

Han Tae-kyu

Geum Tae-woong

Jung Soo-chul, Jung Hyo's father

Assistant Chief Paeng Se-yoon

Jung Ki-joon, Left Minister and Jung Da-yeon's father

Moon Tae-gwang

Baek Gi-bum (42, male / President, Choongshim Construction)

Lee Yi-cheom

Chief Lee Ho-joon

Min Joon-gook (ep. 2)

Park Young-tae, intelligence official and main antagonist, secret lover of Min Hye-rin

Yeom Byung-soo

Min Joon-gook, the murderer of Soo-ha's father, whom he had a grudge on. He was jailed for 10 years as a result of Hye-sung's testimony, which decisively led to him convicted of murder. After his release, he is bent on getting revenge on Hye-sung and Soo-ha for them getting him convicted of murder.

Hwang Tae-sik

Wi Birang (Leader of Danbeomhoe; grandson of King Mayeo of Former Dongbuyeo (East Buyeo) Kingdom)

Han Ji-won

Misaeng

Jang Dong-hwa

Psychiatrist (director of mental health clinic)

Baek Seung-je, signaller of Jang Baek-ho troop