No, this is no reverse harem (thank God): Dominique is a brother-figure (to the point where the male lead asks Dominique to approve of his relationship with Mel), and closest thing to the second male lead is only a friend, knows it, and gives up gracefully.
Hmm...I don't really get this world's magic. So these sorcerers/magicians or whatever are around but they're rare? And do they still have monsters around?
Also, how the heck can the renovation be done in just one day? Magic?? Was it done over a span of a few days? But even 1 week is a stretch..