In order to escape from a business marriage with the ruthless Xiao Lin, the heir to the Xiao Group, Qin Wu, the heir to the Qin Group, signed a one-year flash marriage agreement with Lu Chen, the owner of a coffee shop whom she met by chance. She was free and he got the capital to start a business. After getting along with each other after marriage, Qin Wu discovered that the sunny and casual Lu Chen had a hidden secret: he was proficient in business warfare, familiar with upper-class etiquette, knew the Xiao Group well, and was incompatible with his status as an "ordinary barista".
Lu Chen guarded Qin Wu's father all night when he was critically ill, and accurately helped Qin Wu during the business crisis, allowing the two to secretly fall in love under the constraints of the agreement. When the relationship heats up, the truth suddenly breaks apart: Lu Chen is actually Xiao Lin's half-brother, and his name remains anonymous because he was expelled from the Xiao family. Xiao Lin even revealed that Lu Chen approached Qin Wu in order to take revenge on the Xiao family. The marriage that started with a transaction was instantly in danger.
