On screen
Cast
15 credited performers
Sehun
Koh You
Cho Jun-young
Koh Jun-hee
Jang Yeo-bin
Han So-yeon
Song Jae-im
Dr. Koh
Eugene Jung
Han So-yeon (adult)
Lee Seung-joon
Koh You's father
Park Eun-hye
Koh You's mother
Jung Hye-sun
Koh Jun-hee's grandmother
Jeon Young-in
An Sun-tak
Lee Ara
Shim Jung-eun
Baek Min-hyun
An Sun-tak (adult)
Kwon Hyeok-beom
Jeon Sang-kyu
Seo Beom-sik
Teacher
Myung Jae-hwan
Homeroom Teacher
Kim Kyung-nam
Man at the Park