Since she was 6 years old, Coco's good friend Xixi has left her and left her a necklace to prove her identity. But 8-year-old Coco got a high fever and forgot everything in the past, leaving only a fragment. Ten years later, the cousin of her good friend Xiaoqin returned to China from Switzerland and brought a skirt to Coco, which reminded her of the past and thought that Lin Wuxi was Xixi. At the same time, Coco was forced to sign an "unequal treaty" with Mu Yunxi, the second young master of a company, and lived under the same roof, but unexpectedly discovered many suspicious things. Coco asked a private detective to investigate these suspicious things. When the detective told her the truth, reality did not allow her to find Xixi...