Actually, I haven't thought about the whole plot, but it's probably a story about a handsome boy, a beautiful girl and a handsome boy. Since it's Danmei, everyone will understand what it means.
Yan and Yue couldn't be together due to various reasons. When Yue came back from the United States, he wanted to reunite with Yan Pojing, but Yan refused because he liked Feng. . . . . . . Didn't think about it later