Lee Jae Eun is a top student in Seong Chiung High School, which is the most prestigious school in Seoul. She comes from a pretty average single parent family where she lives together with her mother, who works as one of the Spa Manager in Seoul. Jae Eun got into Seong Chiung High School through a scholarship given to her, despite her family average income and she is very well-liked in school as well. Jae Eun is extremely cheerful, bubbly, but too naive. She tends to show a little bit of violence when she's annoyed at someone. She is a childhood friend of Hongbin, and both of them have mutual feelings for each other.

Lee Jaehwan (Ken) is a troublemaker in Seong Chiung High School. He lives with his dad only, who happens to be the director of the school. He is extremely rich, arrogant and full of ego. Despite that, Jaehwan is a very happy-go-lucky person and doesn't care about anything at all. He has a faulty relationship with his dad and doesn't like to be involved in anything. Jaehwan tends to be really obssessive over the things or someone that he likes and can be very territorial. Oh, and the only thing Jaehwan do in school, is to sleep.

Lee Hongbin is a popular student in Seong Chiung High School. He is an athlete and is extremely good in basketball. Hongbin lives with his dad only, who works numerous part-time jobs in Seoul. Hongbin got into Seong Chiung High School through a basketball scholarship as well and he is extremely popular with the girls in school. Hongbin is a kind person and tends to joke around with Jae Eun a lot since both of them are childhood friends. Both Hongbin and Jae Eun sticks together 24/7 and 365 days.

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What kind of story will unfold between the three of them?