
That'll teach the ML to respect boundaries and knock before barging into another adult's room.
Also, the bit about his dad hating him, driving him away, etc. because he looked like him. Then the saltiness that the ML didn't see it, bc if that wasn't true, then why did his dad always treat him like that. (And it's obvs that his dad treated him like that well before he was old enough to cause problems, so let's not victim blame.) That hurt.
His rationalization was hilarious, though.

Eruki really seems to be the one who is grieving Shirone the most, to the point that it's driving him insane. Every bit of his behavior in the last bit of that chapter was amazing, from the going beyond the limits of death (and calling out the other two for not being willing to) and his spicy moment with the dark siblings.

The bit with the rabbit in the moon, that's stuff parents show kids. His comment about, "Why did no one show me this?" broke my soul a little bit.
Also, the fact that he didn't blow up at the ML for washing his pants in the washer, but just pointed out that he dry cleans them and why. So many people are calling him spoiled, but he's being rather laid back for a spoiled kid. Also, I give him props for having money and still taking care of his stuff. There's plenty of truly spoiled kids who wouldn't even know the wash routine for their own clothes. (〜 ̄△ ̄)〜
I digress, I hope ML continues to warm up, because MC needs someone to really love him. I also feel like the ML might be someone who would stand up to the MC's dad or support MC in standing up to his dad in the future. Also, maybe if the ML could be a little more flexible, that'd be great. I finally see potential, though!

then at least give us a harem ending. Soften the blow and lower the toxicity a bit.

I don't think there's an excuse for the way he started off. ¯_(ツ)_/¯
Also, the way Maythan just accepts the situation without blinking an eye is highly suspect. I don't trust that the Duke will pay his dues, so to speak. On the other hand, the prince has at least put in the time to (try to) woo Maythan, even if his methods are questionable.
However, I'm really counting on sir knight to balance out both psycho boys. He was my main pick from the start. ( ̄ε(# ̄)Σ

If I were the MC, I wouldn't do anything. I wouldn't help, I wouldn't eat, and I would start walking in the general direction of the nearest town. Mr. Bossy Boi might not be interested in being a decent, open minded human being, but I'm sure there's plenty of people to convince in the nearest town.
Dude is over here acting like asking for shampoo and conditioner or picking beans out of rice is some huge deal. Just because you like it and it works for you, doesn't mean it works for everyone. Also, you're not even hearing the MC's side. Dude gives me the ick.
Also, the dad is a jack@ss. He was an absentee parent and now blames his kid for looking for love and affection in all the wrong ways?
I think the MC is being such a good sport right now, really.

I second that. You can kinda see it's supposed to be a learning experience for MC to be less picky and appreciate "people" more, but the message is being delivered poorly. Especially bc of the 'dude' and father, as you said.
You can blame MC for doing nothing with his life and lazing off, but it's fucked up to isolate him just because the dad can't have him "causing trouble" this year - The video that started all of this wasn't MC's fault either honestly.

How you gonna get angry and violent about two full grown adults having consensual sex that leads to an unplanned pregnancy?! Based on what? Being the dude's ex from 20+ years ago? Being his grown ass kid's baby daddy? What claim do you have on that omega to justify that anger?
Dude, it's like you didn't hit it and quit it when the omega was only 14/15 years old. On top of that, you refused to go against your family and put a ring on it when you knocked the kid up. You're the lowest of trash.
Nah, you got no leg to stand on pretending to be his alpha. I hope your ass gets sued. Especially since you were a deadbeat dad for over half of your own kid's life and this boy is over here doing his damndest to show up.
If Garam actually overheard their convo and he's mad at Jaehyuk, that's some serious bs. Jaehyuk just made it absolutely clear how down bad he is for Garam and how protective he is of his man.
If he didn't hear anything, he should at least be giving Jaehyuk the benefit of the doubt. Dude has always been pretty transparent, even when he was a douche canoe. He's also had one of the strongest redemption arcs, where he's been dang near the embodiment if a green flag. Garam needs to stop taking his trauma out on Jaehyuk and punishing him at every perceived possibility of a slight.
Aaargh, so frustrating!! I feel so bad for Jaehyuk (Garam, too, but dude, trust your partner at least a little bit, damn), especially since this is their FIRST real date.
Everything you said is so real and correct (sobbing)