Song Xiao, a professor who teaches rigorously but is cute after class, meets Shen Qingshuang, a student who is usually aloof but secretly a warm-hearted person. When two people with contrasting personalities come together, what kind of relationship will it be like? When a person who has been away for several years suddenly returns to this city, he always carries a secret. What caused him to leave many years ago? A love that countless people are not optimistic about, a love that countless people oppose, but they are the only ones who enjoy it, and can this love go to the end?