as Ko Seo-Yeon

as Han Ji-Hoon

as Bae Joon-Young

as Lee So-Woo

as Park Cho-Rong

as Han Kyung-Moon

as Lee Joo-Ri

as Choi Seung-hyeon

as Ko Sang-Joong

as Seo-Yeon's mother

as Teacher Kim

as Principal

as Detective Oh

as Lee Yoo-Jin

as homeroom teacher

as Lee Sung-Min