I Won the Lottery by Being Able to Write Letters to the Past.

One day, Jiang Bai got a space-time mailbox, through which he could write letters to people in the past. So... [Yesterday I, the winning number of this lottery is...] Wake up and become a millionaire overnight! [My high school self, the school beauty Shen Qingqing's birthday party, actually only invited you. Stop playing games and go! When I woke up, the school beauty I hadn't seen for many years opened the curtains: "Hubby~ wake up!" … Later, Jiang Bai began to write letters to historical figures such as Cao Xueqin, Einstein, and He Shen. The entire history of mankind changed because of Jiang Bai! The Dragon Kingdom is more powerful and its people are more confident! Until one day, a letter from the future... A warning was issued to Jiang Bai!