Kim Ga Young as a school uniform model (Ep.Yang Hee Kyung as Park Min Kyung (Ep.1 & 4).Sam Hammington as Himself, an English teacher (Ep.Bae Soo Bin as Kim Seul Yeong, a teacher (Ep.16).Park Young Soo as a karaoke place owner (Ep.2).Lee Jung Eun as Young Eun's mother (Ep.Lee Kang Min as Soo Yeong's father's senior.Kim Min Kyu as a member of the swimming team.Kim Min Young as Lee Soo Mi, So Yeong's friend.Shin Jung Keun as the student supervisor.Jeon Mi Seon as Song Mi Kyung, Eun Byeol's mother.
Kim Se Ah as Shin Yi Yeong, Shi Jin's mother.Kim Jung Nan as Shin Jung Min, Min Joon's mother.After finding out Lee Eun Bi's real identity, she also became best friends with her.
She is jealous of her friends who seem to have a passion and tries to seek out one of her own.