Moon Geun-young as Seo Bo-eun

Kim Rae-won as Park Sang-min

Kim Bo-kyung as Ji-su

Ahn Sun-Young as Teacher Kim

Kim In-mun as Bo-eun's Grandfather

Song Ki-Yoon as Bo-eun's Father

Han Jin-hee as Sang-min's Father

Sunwoo Eun-Sook as Bo-eun's Mother

Kim Hye-ok as Sang-min's Mother

Park Jin-woo as Jeong-woo

Shin Se-kyung as Hye-won

Ryu Deok-hwan as Dong-goo