Yoon Jin-seo as Kim Ga-in

Lee Ki-woo as Hyung-joong

Park Ki-woong as Hong Seok-min

Kim Min-kyung as Ji Seon-mo

Yeon Je-wook as Choi Sang-gyeong

Jeong Yu-mi as Lee Myeong-hee

Kim So-eun as Kim Ga-yun

Ahn Nae-sang as Ga-in's Teacher

Jeong In-gi as Detective Jo

Ahn Shin-woo as Hong Jae-sun

Kim Jin-geun as Hwang Dae-yong

Kim Do-yeon as Kim Mi-joo

Jeong Wook as Hyung-joong's Father

Kim So-eun as Kim Ga-geon

Oh Yeon-seo as Chung Eun-gyeong

Jeon Kuk-hwan as Ji-sun's Father

Jo Yeon-hee as Kim Ji-sun

Baek Joo-hee as Hyung-joong's Mother

Lee Kan-hee as Ga-in's Mother

Seo Yu-jeong as Ga In's youngest aunt

Ham Yu-seon as Sang-kyung

Kim Soo-woong as Adult Relative

Park Seoung-tae as Dae-yong's Mother

Lee Sae-byeol as Visitor

Kang Lee-seok as Young Park Hyun-joong

Park Sin-woo as Ending Student