Bluebeard

Cho Jin-woong

Seung-hoon

Shin Gu

Sung-geun's Father

Kim Dae-myung

Sung-geun

Song Young-chang

Mysterious Man

Lee Chung-ah

Mi-yeon

Yoon Se-a

Soo-jung

Kim Joo-ryoung

Mi-sook

Son Ji-na

Ji-sook

정아미

Bae Jeong-ja

Kim Gyeong-min

Hospital Director

문정현

Young Hoon

Jo Hyun-woo

Gangnam Detective Team Leader

정진우

Gangnam Detective Team Member 3

유안

Patient

Jeong Do-won

Tatoo

Yoon Byung-hee

Patient