So Ji-sub

Woo-jin

소지섭

黃曦彥

阿杰

Son Ye-jin

Soo-a

손예진

张祎曈

小光

Kim Ji-hwan

Young Ji-ho

郑润奇

Acteur

Ko Chang-seok

Hong-gu

고창석

陈泽文

Acteur

Lee Jun-hyeok

Swimming Instructor

이준혁

王彦桐

Acteur

Zheng Pengsheng

Acteur

손여은

Hyun-jung

Zhong Shaoxian

Acteur

이유진

Young Woo-jin

Kim Hyeon-soo

Young Soo-a

김현수

Zheng Huisong

Acteur

배유람

Young Hong-goo

Seo Jeong-yeon

Seo-bin's Mother

서정연

Park Seo-jun

Ji-ho

박서준

Gong Hyo-jin

Han Bok-nyeo

공효진

Lee Min-sung

Seo-bin

이승준

PE Teacher

Shin Woo-hee

Homeroom Teacher

조하석

Relative

Seo Young-sam

Bus Driver

정수빈

So-jung

백현우

Math Teacher in the Past

정서인

Relative

이보영

Cafe

최요운

Professor