I recommend to you "I Am the Great God, Okay?", a novel about gaming competitions and online games. Although they weren't the same as Lu Han, there was also a plot similar to the female lead's one-sided breakup and reunion. In the story, the male protagonist, Lu Yang, met the female protagonist, Ling Xiaoxi, in the game. The two of them began a wonderful love story because of the game competition, but the female protagonist broke up with her before going to Korea. Later, the two of them reunited, hoping to be together again. I hope you like my recommendation. Muah ~