Secret

Cha Seung-won

Det. Seong-ryeol Kim

Song Yun-ah

Ji-yeon Yu

Ryu Seung-ryong

Je-kal

Park Won-sang

Det. Choi

Oh Jung-se

Kyeong-ho

Kim In-kwon

Seok-jun

Park Hyo-joo

Hye-jin

Yang Eun-yong

Eun-young

Ye Soo-jung

Ji-yeon's mother

Lee El

Young-sook

Choe Yun-Seul

Nurse

Um Tae-goo

Man on phone (non-crédité)

Im Gi-hong

Detective

Yang Geun-seok

[Plainclothes Officer 3]