During the first semester of college, the heroine Shen Tong finally moved out of the school dormitory as she wished and rented a house off campus. Living with him is the male protagonist Fang Tong, whom he has never met before. Fang Tong and Shen Tong were attracted to each other since they met, and then Fang Tong broke up with his original girlfriend. As the relationship between the two becomes deeper and deeper, the relationship between the two is always turbulent and unstable, like a swing under the sycamore tree, swaying in the wind. His physical betrayal of her, her so-called spiritual betrayal of him, and more misunderstandings, suspicions, and betrayals constantly intersected their love, leaving them at a loss. If they are separated for a long time, they will be reunited, and if they are together for a long time, they will be separated. This has actually evolved into a law of love. How long can the two scarred people hold on? What kind of ending will Shen Tong give the story when he starts memorizing it?