Shen Zhiwei was pushed by the An family to take her biological daughter's place in an arranged marriage, thinking it was merely a way to use marriage to investigate her parents' past affairs. Little did she expect that on the day of their meeting, she and Gu Yanchuan would propose marriage at the same time. One of them is outwardly an ordinary deputy director of the An Group, but behind the scenes controls a top-one-hundred global technology company; the other appears to be an unvalued eldest son of the Gu family, but has actually been secretly plotting for years. After marriage, the two hide their identities and keep up mutual pretenses, yet gradually fall for each other while repeatedly backing each other up and jointly investigating past events. But when secrets from over twenty years ago resurface, they realize that this flash marriage has dragged out far more than just the interests of the two families.