Unhappy Happiness

Soo Ae

Byun Ji-sook / Seo Eun-ha

Ju Ji-hoon

Choi Min-Woo

Yeon Jeong-hun

Min Seok-hoon

Yoo In-young

Choi Mi-Yeon

Jeong Dong-hwan

Byun Dae-sung

Yang Mi-kyung

Kang Ok-soon

Lee Ho-won

Byun Ji-hyuk

Jeon Kuk-hwan

Chairman Choi Doo-hyun

Jo Yoon-woo

Oh Chang-soo

Park Joon-geum

Mrs. Song

Jo Han-sun

Kim Jung-tae

Shin Dong-hoon

[Big guy]

Amy Aleha

[Scientist]

Lee Sung-deuk

Byun Ji Sook's high school classmate

Lee Yoon-jeong

Byun Ji-sook [Young]