Song Jin, the heiress of Nancheng's richest family, is ordered by her family to marry Gu Yanchen in a business alliance. Gu treats her with indifference, putting on a daily display of coldhearted perfunctoriness as the wedding preparations proceed. But on the night before the wedding, Song Jin makes a shocking discovery: Gu's new secretary is her own younger sister, who vanished ten years ago. In an instant, Song Jin understands that someone has laid out a political chess game behind this marriage. She decides to play along, using what she knows about her sister to unravel the plot within the plot.
The story revolves around “wedding planning as a plan to break the deadlock.” Song Jin turns the wedding into her stage, planting clues in the hotel, banquet, gift registry, and venue decor. Step by step, she exposes the people behind the scheme, including the uncle she trusts most and the Gu family's criminal underworld ties. At last, on the wedding day, Song Jin personally sends her sister away and brings each of the guilty to ruin.
