"I have to be selfish to meet the standards of the world." 

Wong Yukhei, nicknamed Lucas, is the hottest boy in Moon Yoon Ah's college. Yoon-ah is best known for being a quiet, smart, and good student, never being distracted by dating or parties. Lucas is best known for his deadly good looks, rich family, and confident aura. One day, her friend convinces her to go to a party, where she is challenged by Lucas to not fall for him within a week of pretending they're dating.