It is generally believed that July 14 is the day when the gates of hell are wide open, so few people go out at night. In fact, it's midnight on July 14, and before midnight on July 15, the gate of hell opened and closed again. According to ancient records, this time should be the deadline for ghosts to return to the underworld. On the eighth day of the first month of the following year, that is, the day after the festival, the gate of hell will be opened again, allowing ghosts to travel around the world again. Probably the ghost door was wide open these two times.