Ji Na(you), age 17, is an extraordinary college student who does nothing well save for your impressive memory abilities, yet striving to top the rankings in school. Ruthless and menacing is your cup of tea ever since your parents left this world. You relentlessly worked your way up to Graffiti High, a prestigious campus to create a "Crime Investigation Squad".

However, you never expected Oh Sehun, 18, a notorious tyrant of the school to unleash your inner emotions and he gradually becomes the only being whom you entirely trust. Emerging champion in competitions every year, he is aka the Athletics Team's pride. He faces a smooth flow of wealth, hence his scarce financial issues. He has a horrendous temper and cold personality but you agree on one thing-his mesmerising looks. Fallen prey to his appearance, he gets anything he wants from the school even without any requests.

Wonder how these two students with exactly opposite personalities come together for a collaboration?