One day, Lin Xian got a mysterious space-time mailbox through which he could write to the past. then. [Dear me yesterday, this lottery number is xxx…] I woke up with a lottery ticket in my pocket and won the first prize! [Dear me the day before yesterday, two little girls fell into the water, please save them. When I woke up, TV reporters, flowers, and pennants blocked the way towards Lin Xian’s home!