All That We Loved

Sehun

Koh You

Cho Jun-young

Koh Jun-hee

Jang Yeo-bin

Han So-yeon

Song Jae-rim

Dr. Koh

Jung Yoo-jin

Han So-yeon (adult)

Lee Seung-joon

Koh You's father

Park Eun-hye

Koh You's mother

Jeong Hye-seon

Koh Jun-hee's grandmother

Jeon Young-in

An Sun-tak

Baek Min-hyun

An Sun-tak (adult)

Kwon Hyeok-beom

Jeon Sang-kyu

Lee Ara

Shim Jung-eun

Seo Beom-sik

Teacher

Myung Jae-hwan

Homeroom Teacher

Kim Kyung-nam

Man at the Park