Kim Tae-woo (actor)

Baek Yi-seok: Chief Judge of South Chungcheong District Court

Ahn Tae-sung: Chief of the National Police Station

Sajo Seung

Yoon Geon-hyung, Cheong-ah's father who is the chairman of Jinseong Musical Instruments. As a businessman, he frequently travels so he has no idea how abusive Cheong-ah's step mother is.

Kim Tae-ho

Jin Seong-woo

Gwanghaegun; the King and Princess Hwain's father.

Kim Jwa-geun

Ban Jin-min, Director of Asian Affairs at Interpol's Industrial and Confidential Bureau.

CEO Kim Jae-min. He is a bit over-eager, but an overall well-meaning boss.

Heo Yoon, King Gwanghae's most beloved friend and subject.

Lee Hae-gon

Han Jae-yeol

Ha Ji-seung

Grim Reaper #444

Kim Ji-ryoon

Choi Sang-il – deputy inspector of Seyang District Prosecutors Office, Tae-joon's opponent.

King Seonjo, the fourteenth king of the Joseon Dynasty

Han Ji-hoon

Jung Woo-chul

Jo Moo-chul

Park Jung-do

Park Min-goo (Hye-rim's late husband) (cameo, ep 1)

Jung Hyun-soo

Park Hyung-ki (Chan-woo's classmate)