Shen Jianyue is hired by Gu Chengxuan to spend three years by the side of his rebellious younger brother, Gu Yanzhi, posing as his older sister. She gradually falls for him, only to discover that he sees her as nothing more than a disposable tool. When Song Weiwei, a woman who imitates her in every way, appears, Gu Yanzhi falls completely under her spell. He even forces Shen Jianyue to take the blame for a torn wedding dress and dance in front of everyone at his own wedding. Just when she is utterly desperate, Fu Moyuan, who has secretly loved her for three years, bursts into the wedding and takes her away. Gu Yanzhi finally realizes what he has lost and begins desperately trying to win her back. But Shen Jianyue has already come to her senses, turned away, and headed toward the man who truly cherishes her.