Lee Jung-gil

Yoon Seong-cheol, Jae-gook's father

Choi Jung-pil

Shin Hwa-sik

Shin Ji-sang

Gook Yong-geol

Park Kang-rok

Lee Beom-joong, Hee-kyung's father and the chairman of S&C Group.

Gong Jung-nam

Cho Myung-ho

Jo Sang-gook, Hae-woo's grandfather and CEO of Gaya Hotel Group.

Baek Jae-sang

Wang Gook-hyun

Jo Dong-soo

Han Yong-hee

Jang Chi-gook

Kang Chul-man, Ji-wook's father

Kang Gyo-jang

President Song Choong-hee

Yoon Seok-young (윤석영), Ji-hoo's grandfather

Chairman Kang

Lee Joo-wan

Bong Man-soo

Eulji Mun-deok

Boss

Kim Jong-pil

Kang In-chul

King Chungsuk

Kim Jung-suk

The Yoon Jung-han, Jae-hee's father, the President of Republic of Korea

Gong No-myeon

Bong Chang-soo, Soon-young's father

Dr. Han Tae-joon, Jeong-woo's father

Song Hoe-jang

Dr. Jung Jae-bong (sisters' father)

Lee Sung-chun - Min-chul's father

In-kyung's father

Son Ki Joon

Lee Bang-won/King Taejong of Joseon

Chang Taek-sang