Quân Vương Bất Diệt

Park Won Sang

Park Moon Shik [Team leader]

Kim Young Ok

Noh Ok Nam [Head court lady who raises Lee Gon]

Jeon Bae Soo

Jung Do In [Tae Eul's father / Taekwondo instructor]

Seo Jung Yeon

Song Jung Hye

Kim Yong Ji

Myung Na Ri [Building owner] | Myung Seung Ah [Employee on duty at the Royal Press Office]

Hwang Young Hee

Min Hwa Yun [Shin Jae's mother] / Park Sook Jin / Min Son Young [Palace staff]

Heo Dong Won

Shim Hyung Sa [Homicide detective]

Jeon Moo Song

Yi Jong In [Member of the royal family]

Ahn Shi Ha

Kim Hee Joo [National Forensic Service autopsy doctor] | Kim Joo Hyun [Central Forensic Medical Center autopsy doctor] (Ep. 13)

Kang Hong Suk

Jang Michael [Homicide detective] | Jang Mi Reuk [Royal guard trainee] (Ep.13)

Lee Hae Young

Yoo Gyung Moo [Yi Rim's subordinate]

Lee Hong Nae

Suk Ho Pil [Second captain of the Royal Guards]

Park So Jin

Jo Ha In [Psychiatrist]

Baek Hyeon Ju

Secretary Mo [Lee Gon's general secretary]

Song Sang Eun

Kyung Ran [Tae Eul's fellow police officer]

Kang Gi Doong

Mr. Kim [Seo Ryung's assistant]

Kim Jung Young

[Seo Ryung's mother]

Kim Hyun Woo

Yoon Hwan Soo

Choi Woo Sung

Kim Gi Won

Hwang Se On

Park In Young [Royal guard]

Park Ji Yeon

Park Ji Young | [Pregnant woman] (Ep. 5, 8, 12-13, 15)

Lee Hwang Ui

[Seo Ryung's advisor]