In the prosperous Linjiang City, the urban rhythm is lively, the fragrance of coffee is intertwined with the shadows of sycamore trees. The Gu family and the Shen family regained their old friendship due to a business cooperation. The two elders hit it off immediately and signed a "three-year engagement" contract, tying their children Gu Yan and Shen Zhiyi together. Gu Yan is a rising star in the law firm, with a calm and vicious tongue, but is secretly gentle; Shen Zhiyi is an independent illustrator, seemingly Buddhist but stubborn, and good at resolving embarrassment with a cup of hand-brewed coffee. Under the contract marriage, the two started living together from the "shared roommate" model. One was used to sending work emails at three in the morning, and the other insisted on sleeping until noon on weekends, making jokes frequently. The city lights reflected their journey from mutual dislike to quiet heartbeat. There are oden in the convenience store, the morning rush hour in the subway, succulents on the balcony, birthday reminders hidden in the memo, and the proximity of sharing an umbrella on rainy days. In this city, love is not a grand declaration, but the tacit understanding of having three meals a day and the tranquility of watching the sunset side by side. The contract will expire, but the heartbeat will not.