omg the mc is such a big ahole
instead of helping your apprentice you keep him to yourself to get free healing
really REALLY far down... like you have to get all those affection levels on the character stories and then you'll see that the MC cares and changes, but then in some parts you can choose whether to be an ass or not, there will be options and choices so that'll be on you... be really patient to get through it and don't hate on much. Even some of the slaves who are unhappy or not like him as much as the others who do love him, even they start defending him (Spoiler here: The Elven girl Bronwyn be having a tsundere moment in a life or death situation with him, and he actually says the "L" 4 letter word with the Necromancer chick and she became happy about it all throughout the day)
Oh damn... I have completed it to the point that I have to wait for the new update, and I have forgotten everything... I already dropped it. The only thing I'm certain about is that there is one incomplete quest with an incomplete story with one of the girls (forgot her name, she's one of the professors in a magic school and got our old man mage buddy killed) It may be the same Facility you're talking about, the place where there's gems you need to activate and whatnot, that part is incomplete, you can brute force it and get it done but yeah nothing happens after that part and nothing to do other than collecting the paintings the princess paints for decoration...
Here's a link for all that would help you in your quests
https://www.badkittygames.ca/wiki/index.php?title=Quests
(It's understandable if you feel like you shouldn't click random links, so here's another suggestion: Search up Harem Collector Quest and click the Bad Kitty Games, they're the devs who put that wiki up for players.