Lin Wan, who had been a stand-in for ten years, was left to pick up "Bai Yueguang" by her fiancé Gu Shen on her wedding day. She broke the engagement on the spot, but accidentally discovered that she had a twin sister - and the sister was the shadow that Gu Shen was really chasing. The sister died, leaving behind a baby with a heart disease. Lin Wan took her niece away and joined forces with Gu Shen's nemesis Fu Siheng to uncover the murder, substitution and redemption between two generations and three families step by step.
