Krystal Jung can't forget the boy who defend her agaisnt the bullies ten years ago in the children's park. She considered him as her prince, first love and knight in shining armor. She can't forget the smile that melts her cold heart. But the only problem is she didn't get the boy's name. She believe that they will meet again someday. But what if they indeed meet again and she found out that the boy has an identical twin which even the way they smile is the same? How will she be able to know which one of them saved her? Will she be able to choose the real one?