Why this angle Author syr?
This MC and the FMC interrupt a fuck to welcome someone who had the plan, and was actively acting to carry it out, where if the plan worked, it would kill and/or enslave the MC and his family.
And it's not that the plan didn't work. Because it worked, until the point of capturing the couple. It just didn't work out because of the actions of his friends that the MC had no idea was happening.
His attitude makes no sense, and ends with the arc where he had to escape, where he was scared to death of losing his partner, Where, My God, his pet's uncle died, remember that?, and now he's acting like a person who hasn't been through these things.
Either the Author screwed up, or the main character is a psychopathic recluse.
obs.
The villain thought it was a good idea, seeking shelter in the MC's house was one of the stupidest things I've ever read in a manga.