Lee Ki-young

A doctor of Taekwang Clinic

Yoon Chang-sook, Min-ju's father.

First Vice Director

Oh Chang-hyun, former chief of the Seoul District Prosecutors' Office.

Ko Gi-kwang

Jin Young-seo's father (Ep. 3, 10–12)

Seo Hyun-tae, 64 years old, Chairman of Seo-ryun Group

Soo-hyun's father

Oh Jung-kook

Kang Yi-soo, Eun-gi and Eun-bo's father

Kang Joo-chul

General Eun Hee-jung, Chief of Staff of the Republic of Korea Army.

Sung Wok

Dan Seung-ki (57)

Eun Young-baek, Eun San's father

Yeom Sang-min

Kang Joong-ho

Go San

Lee Tae-sub

Song Byung-gil

King Gaero

Vice-Principal Song Young-man

Choi Jin-sa (60)

Kwon Jae-kyu

Im Chi-hyun

Park Bum-jung. His historical analogue is Fan Zeng.

Kang Il-shik

Kim In-bae

Kang Seung-won

Assistant Chief Oh Jae-ho

Park Byung-sam

Park Bi-soo

Matsumoto Junichi

Chun Man-hee

Kang Dae-ho, Goni's stepfather

Kim Jung-gil

Kang Jung-ho

Go Sang-ki

Uhm Sang-taek, Kang-jae's right hand

Chief Jung

Choi Se-chang

Chief Goo Bon-chul

Kang Ji-hoon/Kevin

Kim Cheon-chul, gangster boss

Lee In-soo, Gangster leader

Choi Deuk-gu, Jang Baek-ho troop