It is said that evil ghosts must go through eighteen layers of hell of nether world to purify into an infant, starting from the sewer, then to the soaking of water, burning of fire, pressing of the iron pad etc. They finally line among the Soul Express sent by the black and white ghosts for reincarnation, who act as the postmen shuttling between the real world and the hell. Their work is to arrest the evil ghost hiding in the human world, sending them to the nether world to be processed into the Holy Spirit and send these spirits to human' world again. However, all these soul packages have the limited hours and the spirits will become ashes if the delivery is not on time.
The story occurred when the Black and White ghost delivered the express, who accidently met a female postman from the human world. This female postman was scared by the look of these two ghosts, frightened enough to mistakenly got the packages of black and white ghosts.
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