Review Detail of Everything_Forever in Once Human, Now a Parasite

The MC was ok in the beginning with an ok background and a cool OP ability and all that. The MC finds a cave with a lot of cool stuff in it that I found interesting then he decides to go into town and read up on the history of the world he was in. He then decides to go to an auction which is okay I guess,like he probably has better stuff anyway but ok. Then he buys some demon girl for "information" and I thought it would be cool if he becomes his servant or bodyguard or something like that but no,she becomes his love interest or something which doesn't make any sense considering of his history and the girls! I guess the author wanted to make him softer so he did this or author wanted romance in the first place and didn't do it well. All in all the plot was interesting and I liked the MC in the beginning but after the romance started it messed with plot and just made MC and the girl really annoying,in short romance was forced and it wasn't enjoyable after that.