My parents force me to enter Sehwa High School, the best and elite High School in Seoul, I refuse them but they still force me to attend the test. So I have to attend the test even though I'm sick. Surprisingly, I pass the test, means I can't be with my best friends, Eunhee and Jaebum since we enter the different school. In Sehwa HIgh School, I meet 12 handsome seniors yet weird. They have different characters and attitudes when they face me or talk to me. My first meeting with them is because on my first day in that school I already make a trouble...with those 12 handsome and cool seniors.