Kim Hie-won

as Huh Yakseon

as Director of Research Institute

as Doctor Yang

as Sun-woo

as Park Young-jin

as Woo Ji-man

as Soon-mo

as Lee Gyu-ho

as Department Head Kim

as Jong-bae

as Patrick

as Teacher Ttong

as Master Park

as Romanticist

as Teacher Kim

as Sakamoto

as Jung-mi's Husband

as Oh Guk-cheol

as Xiangdong

as Byung-gab

as Nam Geon-hee

as Detective Park

as Do-gyoon

as Hwang Man Shik

as Kim Jin-man • 10 eps

Director • 8 eps

1 eps

as Lee Chun-seok • 6 eps

as Won Jong-muk • 16 eps

as Choi Il-hwan • 21 eps

as Self • 2 eps

as Self • 1 eps

as Choi Kwang-gook • 1 eps

as Self • 54 eps

as Jo Hyung-Joon • 32 eps

as Kim Hee-won • 12 eps

as Self • 1 eps

as Park Soo-Chil • 40 eps

as Choi Yoon-gi • 12 eps

as Self • 1 eps

as Self • 2 eps

as Jung Min-Chul • 12 eps

as Self • 1 eps

as Park Jong-shik • 4 eps

as Park Byung-hee • 21 eps

as Lim Taek-soo • 18 eps

as CEO Go • 12 eps

as Sojung • 24 eps