What's Wrong With Secretary Kim

Lee Young-joon

Kim Mi-so

Bong Se-ra

Lee Sung-yeon

CEO Lee

Kim Ji-a

Park Yoo-sik

Yoo-sik's Ex-wife

Go Gwi-nam

Madame Choi

Park Joon-hwan

Yang Cheol

Lee Young-ok

Jung Chi-in

Seol Ma-eum

Lee Young-joon / Lee Sung-hyun

Kim Pil-nam

Kim Mal-hee

Young Kim Mi-so

Young Lee Sung-yeon

Kim Young Man [Mi So's father]

Bae Yun Sung [Intern]

Oh Ji Ran [Famous model & onetime girlfriend of Young Joon]

Chairman Lee [Yeong Joon's father - Young]

Mrs. Choi [Young Joon's Mother - Young]

Mi So's mother

Jang Jeong Do [Fashion Designer]

Mi So's father

Host of the book concert

Staff who talked behind Kim Mi So's back