In order to save her father, an ordinary girl gets married to a strange heir of a wealthy family. A contract draws the line. He is the indifferent "partner" and she is the "airborne wife" of the wealthy family. When she stepped into the carved iron door wearing a cheap old watch, she discovered how many undercurrents were hidden in this transaction: the forbidden area in his study, the secret of the same old watch in the drawer, and the covetous sidelines in the Gu family's deep house. In a contract marriage, why did he care so much about the appearance of her wrist? When she transforms from a helpless "fake wealthy lady" to a Mrs. Gu who can take charge of her own business, is this relationship that started with a transaction a trap set by him, or is it a hidden candy of fate? Is their marriage a cold contract, or has their sincerity been moved by temptation?