Yoon Jin-seo
Kim Ga-in

Lee Ki-woo
Hyung-joong

Park Ki-woong
Hong Seok-min

Kim Min-kyung
Ji Seon-mo

Yeon Je-wook
Choi Sang-gyeong

Jeong Yu-mi
Lee Myeong-hee

Kim So-eun
Kim Ga-yun

Ahn Nae-sang
Ga-in's Teacher

Jeong In-gi
Detective Jo

Ahn Shin-woo
Hong Jae-sun

Kim Jin-geun
Hwang Dae-yong

Kim Do-yeon
Kim Mi-joo

Jeong Wook
Hyung-joong's Father

Kim So-eun
Kim Ga-geon

Oh Yeon-seo
Chung Eun-gyeong

Jeon Kuk-hwan
Ji-sun's Father

Jo Yeon-hee
Kim Ji-sun

Baek Joo-hee
Hyung-joong's Mother

Lee Kan-hee
Ga-in's Mother

Seo Yu-jeong
Ga In's youngest aunt

Kim Soo-woong
Adult Relative

Park Seoung-tae
Dae-yong's Mother

Lee Sae-byeol
Visitor

Kang Lee-seok
Young Park Hyun-joong

Park Sin-woo
Ending Student