맨홀

정유미

as Yeon-seo

Kim Sae-ron

as Soo-jung

정경호

as Soo-chul

최덕문

as Kim Jong-ho

조달환

as Pil-gyu

이영유

as Kim Song-yi

윤찬영

as Soo-chul (Young)

김빈우

as Female Victim

윤돈선

as Policeman

Jun Yoon-ji

as Bakery Part-time Worker

김재화

as Social Worker

Seo Kyung-hwa

as Yeon-seo's Mother

고다연

as Soo-chul's Older Sister

신동력

as Soo-chul's Father

서현우

as Male Police Officer

김미희

as Female Police Officer

Ha Ji-eun

as Woman in Haengdang Area

김아람

as Mummy

윤태인

as Man of Couple

Song In-seop

as Cellphone Man

강덕중

as Rookie Laborer