Type movie Release Date Mar 15, 2018 Country South Korea Language Korean Genre Romance Drama Fantasy Cast So Ji-sub as Woo-jin Son Ye-jin as Soo-a Kim Ji-hwan as Young Ji-ho Ko Chang-seok as Hong-gu Lee Jun-hyeok as Swimming Instructor Son Yeo-eun as Hyun-jung Lee You-jin as Young Woo-jin Kim Hyun-soo as Young Soo-a Bae Yoo-ram as Young Hong-goo Seo Jung-yeon as Seo-bin's Mother Park Seo-jun as Ji-ho Gong Hyo-jin as Han Bok-nyeo Lee Min-sung as Seo-bin Lee Seung-joon-III as PE Teacher Shin Woo-hee as Homeroom Teacher Jo Ha-seok as Relative Seo Young-sam as Bus Driver References imdb