A young man in 2021 traveled to a world in 1991. He thought he had traveled through time, but in fact, he traveled halfway through the time. The other party's consciousness was too strong, so he became a personality of the other party, sharing a body with the other party, and could talk and exchange ideas. Sometimes, when the other party's consciousness was not strong, he could control the other party.
As they got along, he helped each other grow up and accompanied him through the troughs of life. While the two were pursuing themselves, they also discovered many secrets. He also tried to change the past, but found that he was powerless. But in the whole process, they both became better people.
Concept: The story of a boy becoming a man