Cast
Sehun
Koh You • 8 episodes
Cho Jun-young
Koh Jun-hee • 8 episodes
Jang Yeo-bin
Han So-yeon • 8 episodes
Song Jae-rim
Dr. Koh • 8 episodes
Jung Yoo-jin
Han So-yeon (adult) • 8 episodes
Lee Seung-joon
Koh You's father • 8 episodes
Park Eun-hye
Koh You's mother • 8 episodes
Jeong Hye-seon
Koh Jun-hee's grandmother • 8 episodes
Jeon Young-in
An Sun-tak • 8 episodes
Baek Min-hyun
An Sun-tak (adult) • 1 episodes
Kwon Hyeok-beom
Jeon Sang-kyu • 1 episodes
Lee Ara
Shim Jung-eun • 2 episodes
Seo Beom-sik
Teacher • 1 episodes
Myung Jae-hwan
Homeroom Teacher • 1 episodes
Kim Kyung-nam
Man at the Park • 1 episodes