Assuming that the ghost spirit was really [Slow-Witted Song], this matter touched upon the theory of time.
'Slow-Witted Song' was someone from the past. If Song Shuhang's guess was correct, wouldn't that mean that his ghost spirit had traveled through time and space, returning to the past?
Movies and TV shows had already overused the reincarnation genre in the past years. Reincarnating into the past, into the future, into another world, into hell, into heaven... there was no time nor place that the 'reincarnation' army couldn't go to.
There were many different types of 'reincarnation', such as moving over with one's real body, possessing someone else's body, rebirth, gender bender, and so on.
The causes for 'reincarnation' had been increasing over time. In the beginning, there was still a relatively rigorous usage of futuristic technology to 'reincarnate', and then came the more random reasons—at some point, squatting inside a hole or drinking water had become potential reasons.
