Su Qinghuan transformed from the eldest daughter of the Su family to a debt-ridden Cinderella overnight. In order to raise money for her mother's medical expenses, she was forced to sign a secret lover's contract with Xiao Yu, a second-generation handsome ruffian well-known in Beijing circles. Xiao Yu is flirtatious and funny on the surface, but he hides his thoughts; Su Qinghuan is aloof and money-obsessed, but has a peerless appearance and a arrogant nature. The ambiguity of the Communist umbrella in the rain, the turmoil of old acquaintances turning against each other, the disturbance of anonymous love letters, and the suspicion of undercover agents lurking around them gradually changed the flavor of this contract that started with interests. When the sunny and coquettish Mr. Xiao meets Su Qinghuan, who is cold on the outside and hot on the inside, who will fall first in this love game full of temptation and excitement?