January 1, 2000 was the start of a new century. The start of a new year. On that day, two families suffered from a car accident, where only their children survived: 7 year old Kim Kai and Park Chanmi. On that day, hatred began forming in Kai's heart, and he vowed to make Chanmi pay for the death of his only family member. 17 years later, they meet again, and before Kai can grasp what's happening, he finds himself doing something that he never wanted. Something that would prevent him from pursuing his goal of getting revenge: falling in love with Park Chanmi. 

Soundtrack:
Moonlight // EXO
Promise // EXO
Sorry (Dear Daddy) // f(x)
Set Me Free // SM Ballad (Taeyeon)
Baby Steps // TaeTiSeo
Beautiful // EXO
Day 1 // K. Will
It's Because I Miss You More Today // Davichi
One Person // Minah from Girl's Day
Europa // Girls' Generation
Love Like Fairytale // APink