Four people in the same class traveled back to the ancient Dayuan Kingdom at the same time. When I don't know the specific identity, I find that my soul will come back one night every few weeks.
The few people who discovered this slowly understood their identities and what was about to happen. So they decided to prevent things from happening and joined forces to go out. They also understand each other's feelings when they join forces.
However, can the ending really be as they wish...
Intention: love, intrigue