Lee Seung-joon

Go Yoo's father

Dong-won Kim

Kim Hak-soo

Jo Joon-Young

Go Joon-hee

Song Jae-rim

Dr. Go [Mental health specialist]

Jeong Eu-Gene

Han So Yeon (adult)

Eun-hye Park

Go Yoo's mother

Oh Sehun

Go Yoo

Ki Eun-Yoo

Go Yoo [child]

Jeon Yeong-in

Ahn Soon-tak

Hye-seon Jeong

Go Joon-hee's grandmother

Beom-sik Seo

Teacher

Kim Si-woo

Go Joon-hee (child)

Kwon Hyuk-bum

Jeon Sang Kyu

Yeo Bin Jang

Han So-yeon

Yang Ha-yoon

TV show host] (

Kwon Oh Geon

Go Joon Young

Min-Hyun Baek

Baek Min Hyun

Myung Jae Hwan

[Homeroom teacher]