A grown up Mo Fan got transmigrated into the magic world world instead of a 15 year old version, this forced ROB to change his memory due to a novel he read and compensate him.
Also changing the plot will probably be gradual since Mo Fan doesn't have any knowledge about the future. It'll depend on the system.
I don't know Chinese and the names of new or unnamed Characters were made using a random name generator. Take no offence.