After an accidental time travel, a modern top math genius wakes up in the body of a little girl living in the 1980s. Born into an ordinary family with tough living conditions, she relies on her outstanding mathematical talent and sharp wits. She solves daily troubles, helps her family get out of hardship, earns money with her wisdom, wins admiration from everyone around her, and gradually writes a warm and wonderful life story with numbers and courage in the old era.
