Mask

Soo Ae

as

Byun Ji-sook /...

Ju Ji-hoon

as

Choi Min-Woo

Yeon Jeong-hun

as

Min Seok-hoon

Yoo In-young

as

Choi Mi-Yeon

Jeong Dong-hwan

as

Byun Dae-sung

Yang Mi-kyung

as

Kang Ok-soon

Lee Ho-won

as

Byun Ji-hyuk

Jeon Kuk-hwan

as

Chairman Choi ...

Jo Yoon-woo

as

Oh Chang-soo

Park Joon-geum

as

Mrs. Song

Jo Han-sun

as

Kim Jung-tae

Shin Dong-hoon

as

[Big guy]

Amy Aleha

as

[Scientist]

Lee Sung-deuk

as

Byun Ji Sook's...

Lee Yoon-jeong

as

Byun Ji-sook [...