Lee Seung-joon (actor, born 1973)

Hyun Sang-chul

Choi Kyung-jong, a professor of emergency medicine and Seung-hyo's father.

Ji Kyung-hoon

Ha-neul's psychiatrist

Jung Bong-wan

Gang Bong-go

Heo Bum-soo

Cha Ju-man

Yoo's father

Jung Seung-joon / Jung Dang-myeon (pen name)

Kang Choong-mo, Choi Yeon-soo's good friend in college, now a high ranking government official working at the Blue House Hong Jin-gi as young Kang Choong-mo

Kim Dae-yoon (ep. 12)

Kim Gi-ha

Choi Jin-moo

Kim Cheol-woong, News Live director who is married to Hee-sang.

Charlie Jung, a fashion designer (Ep. 1–2, 10)

A doctor

Jung Yoon-jeo, Nok-du and Hwang-tae's father.

Kang Geun-taek

Emperor Gojong Kang Yi-seok as young Emperor Gojong

Kim Hyun-gyu

Doctor (ep. 3)

Yoo Myung-ho, the report bureau chief.

Han Seong-hoon

Song Sang-hyun (General Surgeon)

Pyo Young-gyoon

Jang Jin-woong – 36-year-old, internet entertainment show "Star Live" reporter

Restaurant owner (ep. 17)

Kwon Young-chan

Kwon Ji-hoon

Park Won-jae

Yoon Jung-mok

Han Young-hoon

Choi Kwang-min, Chairman Jo Han-il's secretary and Kwang-soo's older brother

Kwon Ik-joo

Young-ae husband (season 12-17)