Lee Ji-ah
Shim Soo-ryun (48 eps)
Kim So-yeon
Cheon Seo-jin (48 eps)
Eugene
Oh Yoon-hee (48 eps)
Uhm Ki-joon
Joo Dan-tae (48 eps)
Shin Eun-kyung
Kang Ma-ri (48 eps)
Bong Tae-gyu
Lee Gyu-jin (48 eps)
Yoon Jong-hoon
Ha Yoon-chul (48 eps)
Park Eun-seok
Logan Lee (48 eps)
Yoon Joo-hee
Go Sang-ah (48 eps)
Ha Do-kwon
Ma Doo-gi (48 eps)
Kim Hyun-soo
Bae Ro-na (48 eps)
Jin Ji-hee
Yoo Je-ni (48 eps)
Kim Young-dae
Joo Seok-hoon (48 eps)
Han Ji-hyun
Joo Seok-kyung (48 eps)
Choi Ye-bin
Ha Eun-byeol (48 eps)
Lee Tae-vin
Lee Min-hyeok (48 eps)
Kim Dong-Kyu
Secretary Jo (48 eps)
Kim Do-hyeon
Secretary Do (48 eps)
Ahn Yeon-hong
Jin Boon-hong (27 eps)
Jo Soo-min
Anna Lee / Min Seol-ah (21 eps)
Jeong Seong-mo
Cheon Myeong-soo (21 eps)
Choi Yu-ha
Attorney (21 eps)
Park Ho-san
Yoo Dong-pil (15 eps)
On Ju-wan
Baek Joon-ki (15 eps)
Ki Tae-hwa
Soo-ryun's ex husband (4 eps)
Lee Sang-woo
Reporter Son Hyung-jin (2 eps)
Yu Jun-sang
Jung Doo-man (2 eps)
Ahn Tae-hwan
Seo Young's husband (1 eps)
Bret Allan Lindquist
JohnBIO Conference Attendee (1 eps)