June 8. Beijing. A pretty girl lies dead on the floor of her luxury home. A slip of paper found on her body reads, "I am tired. Let me leave..." At the bottom of the slip is a signature: Lin Shuang-shuang. Shuang-shuang has a twin-sister called Dui-dui. The two girls look so similar that others can hardly tell who's who. Is the one who died really Shuang-shuang? Then where is Dui-dui? If the one who died is Dui-dui as someone claimed, then why is the signature on the slip Lin Shuang-shuang?