He, Xia Fan, lost because of a boring bet.
This bet led to meeting her again from the rain.
It turned out that they had known each other a long time ago, and it was also because of the rainy day.
When her senior year of high school started, she disappeared.
Completely disappeared from his life.
Only then did he realize that he had lost his heart to her.
Six years later, they met again, and this time he wouldn't miss it.