Perfect Number

Ryoo Seung-bum

Suk-go

Lee Yo-won

Hwa-sun

Cho Jin-woong

Detective Min-bum

Kim Yoon-sung

Sang-joon

Kim Bo-ra

Yoon-ah

Lee Seok-jun

Nam Tae-woo

Lim Sung-min

Jung-sook

Kwak Min-ho

Chul-min

Kwon Hae-hyo

Team Leader

Nam Moon-chul

Director

Kim Ah-ron

Girl

Kim Joo-ryoung

Madame

Park Hyoung-soo

Investigator 1

Nam Yeon-woo

Investigator 2

Lee Kyoo-hyung

Suk-go (Teen)

Dong Bang-woo

Innkeeper

Song Young-chang

Lie detector investigator

Choi Young-woo

Forensic team member #1