When the early autumn wind swept the sycamore leaves and covered the windowsill, a young man named Jiang Yichen broke into Xia Xingmian's life. He was the "intruder" who occupied his study room, the top student in his grade, and the "rival" who deliberately knocked him down on the basketball court. The cold war under the same roof and the tit-for-tat confrontation on campus have become the norm for the two of them to get along. But no one knows that the choking in the corner of the rooftop, the peeks in the library during the rainstorm, and the antipyretics bought over the wall late at night have already caused unwanted emotions to quietly breed in the cold separation. When the rice dumplings were steaming on the night of the winter solstice, when the suppressed hearts broke through the shackles, they thought they could hold each other's hands, but they were forced to separate by family storms and worldly rumors. Seven years later, in the debate competition, Xia Xingmian from the Law Department once again bumped into Jiang Yichen from the Finance Department. Can time melt the ice of the past so that winter snow can finally cover summer branches?