To Us, from Us plot
"A letter from ourselves in the future."
In Shenzhen (China), in a rebellious high school class, the girls, led by Miaomiao, are diametrically opposed to the boys led by Chen. They make it a sport to be the first to bully the new math teacher away. One day the captain of the boys receives a letter, which the class has sent to themselves one year in the future. The letter foretells disaster unless the class makes an effort to turn history around. When the first prophecies come true, the boys and girls agree on a mutual truce.