Lee Won-jong

Kim Man-sik

Han Sang-man

Yoon Sang-gyu, Kim Ho-ran's former secretary and right hand man.

Ha Ji-man

Detective Squad Chief Yoo

Jung Jong-chul

Bae Gong-dae

Yook Gwang

Kang Hee-seok, a 55-year-old radio station director.

Jo Pil-doo

Jang Gwang-ho

Oh Sung-hwan

Go Sung-min

Jang Ho-jin – Nan-hee's father

Yoo Sang-won's father

Noh Jang-soo (Noh Eul's father; episode 2)

Detective Lee Cheol-yong

Na Do-kwang

Ji Dong-chan

Choi Tae-pyung

Dok-man; Goryeo-born who become the Yuan eunuch in Aekjung Palace.

Geo-chil

Lee Yong-bae

Joo Pal, a local gangster

Yoo Young-gil, Eun-jae's father

Andy Wilson, pianist

Hong Dae-ju, Joseon's Minister of State and the series' principal villain.

Park Hong-choon

Double-acting slave at the training site

Yeom Sa-chi

Seok-bong's middle school math teacher

Shaman (episode 8)

Mae Wang (Choi Go-dong), a car dealer

Cha Cha-sung: Leader of the Happy Joy theater

Yun Hoe

Dal-pyung

Byeon Shik, Eun-chae's and Si-wan's father, Si-hoo's foster (supposed real) father

Ma Dong-po

Kim Seo-bang

Bang Man-bok

Goo Ma-juk (ko)