Lin Huaide, who had just celebrated his 30th birthday, unexpectedly traveled to another parallel time and space, returned to high school, and became a transfer student at Dingfeng No. 1 Middle School.

Lin Huaide reunited with his former friend Ji Er in order to save his friend who had committed suicide.

Lin Huaide tried to find the BUG of time and space. She found that the direction of history was the key to breaking the stalemate of time and space. In order to break the stalemate, she began a journey to change everyone's lives.