<Li> Kim Young - hee (Yoon Bok - in), Seol's mother . </Li> <Ul> <Li> Jang Bo - ra (Park Min - ji), Seol's supportive best friend . </Li> <Li> Kwon Eun - taek (Nam Joo - hyuk), Seol and Bo - ra's loyal friend, who is in love with Bo - ra . </Li> <Li> Oh Young - gon (Ji Yoon - ho), a delinquent who is obsessed with Seol . </Li> <Li> Son Min - soo (Yoon Ji - won), a shy classmate who gains confidence by assuming Seol's identity . </Li> <Li> Kim Sang - cheol (Moon Ji - yoon), a lazy senior in Seol's class . </Li> <Li> Lee Da - young (Kim Hye - ji), a girl in Seol's class who dates Young - gon . </Li> <Li> Nam Joo - yeon (Cha Joo - young), a girl who is obsessed with Jung at the beginning of the series . </Li> <Li> Kang Ah - young (Yoon Ye - joo), Seol's junior and Joon's love interest . </Li> <Li> Ha Jae - woo (Oh Hee - joon) </Li> <Li> Kim Kyung - hwan (Go Hyun) </Li> <Li> Min Do - hyun (Shin Joo - hwan) </Li> <Li> Heo Yoon - sub (Lee Woo - dong), Seol's boss at her university admin job . </Li> <Li> Professor Kang (Hwang Seok - jeong) </Li> <Li> Professor Han (Kim Jin - keun) </Li> </Ul> <Li> Jang Bo - ra (Park Min - ji), Seol's supportive best friend . </Li> <Li> Kwon Eun - taek (Nam Joo - hyuk), Seol and Bo - ra's loyal friend, who is in love with Bo - ra . </Li>

Nam joo hyuk di cheese in the trap