He has been a famous figure for generations through the ages; in order to repay the kindness of three people, he did not hesitate to work hard.
She, a future computer worker who admires his loyalty and wisdom.
She and he were separated by more than 1,800 years, and the chance of meeting each other was not something that should have happened. However, they met because of a joke of time and space.
So in order to realize his wish and rewrite his ending, she joined forces with her friends who were separated through time and space to try to change history.