Yoon Joo-sang

Kim Jang-soo

Go Mul-sang

Jegal Han-ryang

Lee Cheol-soo

Han Ji-man, Yoo-hyun's father

Chairman No. (Episode 6)

Bong Chu-san

Hwang No-seop

Lee Won-gil

Moon Seong-woo, a 57-year-old DJ of a thirty-year old radio program.

Moon Tae San

Jang Yong-geon

Kang Joon-chae

Choi Chun-Sool, a renowned acupuncturist who owns the Haeminseo Oriental Medicine Clinic and is Yeon-kyung's grandfather.

Kang Min-joo's father

Stationmaster of Re-Life Centre

Park Man-jae

Ko Byung-shik, Ko Yoon-jung's father, a food blogger.

Yoon Gil-jae

Jang Won-sik

Boss Yoon

Chanyeol's grandfather

Lee Gook-hwan

Jo Hee-moon

Priest (ep 1 and 14)

Na Dae-ho, Eun-jin's father

Oh Hyun-kyu

Lawyer Shin Sang-deok

Jo Bong-soo, gym teacher

Moon Sang-il - former head of drama programming.

Seok Joo-hwan

Ji-ahn's father

Lee Hak-goon

Lord Kim, Eun-oh's father

Prison warden Kim

Jung Moon-soo (cameo)

Kang Dong-poong

Min Dong-ho (president of the adversary party)

Mul-Soe, a Blacksmith

Lee Jung-hyun

Lee Joon-bae

Director Yoon

Song Ok-goo: Chief of Biryuna, father of Song Maeseolsu

Dr. Kim Yoon-jong, hospital director and father of Boksil

: Professor Ahn

President Jang Tae-mun

Sa Shin ("Angel of Death" or "Reaper")

Choi Jong-man

Ko Yeon-joong

Chief Uhm

Sunwoo Kwan

The commanding officer

Jung Geon-woo, Yoo-min's grandfather