Based on the hints and the 2 arcs so far, it’s the same ML every arc and a lovely HE.
As the story progresses, the reader will notice that the MC is seriously messed up - and the MC himself clearly knows this too. At first it will be small hints:
• Him calling (and viewing) the MC and other living beings 'his things'.
• Him adapting to killing other living beings in the early few chapters, though he was human just a few days before, and not feeling anything about it.
• And most of all him being extremely posessive of 'his things' to the point he'd rather kill them than let them go - and rather break them than let others have them.
Later on a lot of flasbacks and whole chapters describe the sh*tty childhood and non-existing care he received growing up - which in real life clearly would make anyone turn more or less insane.
But later on he does change in small ways, and it does end rather sweetly.
And though a lot of reviews points out that the ML is clingy and insecure, I think most people would react/become like that considering their world's discrimination of different species and the experiences he's had.