Review Detail of Necessimy in The Gene Witch System

There are many places where the author said one thing but it actually seems like something else. For example, The MC said that the time machine sent him back in time, however he then appears to be in a different world, no big reaction. The system seems to know a lot of things about this new world (that the inhabitants might not know)even though its just got here, no reason given. The MC is acting all mysterious even though the previous host has given him a brilliant excuse(of being a wolf in sheep clothing), he's not telling his sister about his magic because he thinks she wont believe him but he can literally do magic! So, many inconsistencies with rubbish explanations.