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So Ji-sub

Woo-jin

Son Ye-jin

Soo-a

Kim Ji-hwan

Young Ji-ho

Ko Chang-seok

Hong-gu

이준혁

Swimming Instructor

손여은

Hyun-jung

이유진

Young Woo-jin

김현수

Young Soo-a

Bae Yu-ram

Young Hong-goo

서정연

Seo-bin's Mother

박서준

Ji-ho

공효진

Han Bok-nyeo

Lee Min-sung

Seo-bin

Lee Seung-joon-III

PE Teacher

Shin Woo-hee

Homeroom Teacher

조하석

Relative