In the library in late spring, when the thread-bound "Book of Songs" slipped from a height, He Huanian reached out to catch not only the yellowed pages, but also his uncontrollable heartbeat for Wang Jinse. He is a young boy who has just entered college. His notebook is full of academic questions and he secretly wrote, "The way she lectures is like a spring begonia." She is a newly hired literature teacher. Her fingertips are gentle when she runs through the annotations in ancient books, but she hides her grievances when facing her boyfriend's perfunctory behavior. A discussion about "Li Qingzhao's Marriage Dilemma" brought the two hearts closer and closer - he would occupy a window seat half an hour in advance and bring a cup of warm low-sugar milk tea; she would hand him cold medicine with handwritten medical instructions when he caught a cold. But the age gap, the opposition of her parents who are "well-matched", and the rumors of "teacher-student ambiguity" maliciously spread by her boyfriend, hit this cautious relationship like a shower. He shielded her from the harassment of drunken gangsters, even though he had a scar on his arm, he smiled and said "it's okay"; she climbed through the window for him to escape from the house where he was under house arrest, hugged each other at the train station and said "I'm waiting for you"; even the pen he gave her became the courage for each other to cross different places and confront public opinion. From the secret agreement in the library, to the calm hand-holding on the streets of Nanjing, to the proposal of roses folded from ancient books in Suzhou gardens, they broke prejudices with sincerity and proved with perseverance: the best love is to be able to read the romance in ancient books together, and to shoulder the storms of life side by side. When the label of "teacher and student" fades away with time, what remains in time is the gentle echo of the two souls achieving each other.