13 years ago Jang Hyungseung moved from the countryside with his parents due to a tragic incident, one that he couldn't quit remember. He spent the remainder of his teenage days living in Seoul, studying hard and preparing to get into the best Univeristy in the country. And when he wasn't studying or at school, he was spending time with his childhood friend and girlfriend Sun Hee (Sunhee). They had always been drawn together and never thought it strange that befor each other, they were never with another.

They only needed each other because they shared a dark past. One in which neither of them truly remembered until an old aquatence came to visit them and turned their world upside down.

The deadly game is about to begin...