Lee Deok-hwa

Kim Young-soo

Baek Hyun-moo, an attorney who founded a large law firm, grandfather of Baek Ma-ri.

Chairman Kang Da-goo

King Yeongjo

Oh Pyung-pan

(ep. 4)

Do Jin-myung

Prisoner #2460 (ep. 8)

Hwang Jae-man

Chairman Wang

Shin Seok-ju

Wang Shik-ryum

Han Ki-young, Mo-ran's ex-fiancé (episodes 21-22)

Gu Myung-han

Lee Jin-sam

Lee Joong-goo

Na Yoon-hee's father (cameo, ep 6)

Chairman Jo Han-il, father of Jo Min-hyuk and Jo Min-joo

Baek Chang-hak

Jin Si-hwang (Yeo-chi's grandfather). His historical analogue is Qin Shi Huang, the last emperor of Qin dynasty.

Jang Do-hyeon

Chairman Joo

Kim Tae-sung

King Dongmyeong of Goguryeo (Go Jumong, 1st king of Goguryeo)

(이덕화) as Park Woong (박웅)

Hwang Tae-seob

General Gang Gam-chan

Han Beom-man, Ae-ja's husband

Xue Rengui

Park Byung-sam

Chun Doo-hwan

President Choi Eun-chul

Choi Do-hwan, Jung-won's father

Yi Ui-min