I do kinda feel bad and they deeply regret everything even they're under the influence of love potion but tolerating pina when they have their own consciousness is a big no no no to me, the prince knew pina was wrong in all places but she purposely use the "national treasure" shitlag card which makes them even more helpless also they didn't believed remi/emi or listen to her side which emi only spiraling her reincarnated self to coma/darkness so boohoo to the guys
Nope no guilt hating on them. I read a spoiler where they wouldn’t have been affected by the love charm/potion/magic if they truly loved and believed in Remi. Somewhere in their hearts, they felt inferior and the (I’m just gonna say magic) magic affected that part and allowed Pina to brainwash them.
Long rant about the "friends" below containing spoilers from the novel. TL;DR is that no, I don't feel bad and I agree with the reply above mine. The potion never made them forget of Emi's kindness nor her personality. They just choose to not side with her, even though they have some autonomy and are aware of what they were doing (the brother is the worse in this regard, see more below as to why). If they didn't have even an inkling of bad thoughts towards Emi (before getting a whiff of that potion), none of these would've happened.
I'm not sure what the deal was with the knight friend who was engaged with Sofia. Maybe he was jealous of Emi for being so perfect too, idk. But all the other "friends" are scum.
First, we have the prince/ex-fiance who has a massive inferiority complex. He thought that isolating Emi and seeing her look of hurt made her seem more human. He thrived at seeing her fiance who was perfect in every way starting to break down, this made him feel better about himself as he saw it as an opportunity to finally be on equal footing with Emi. That's also why he came up with that 'I'll break up our engagement' plan where he wanted to hear her admit to her "crimes" and apologize, which after he was planning to take her back again and keep Pina as a concubine (this mf istg).
Next, we have the brother (cousin who Emi helped by saving his dad, but the dad still died of illness later so he was adopted into Emi's house as her brother). This guy loved Emi (not in a sibling way which btw eww they're still cousins), but he couldn't do anything because she's already engaged to the prince. So, when he saw that Emi was getting isolated like that, dude was rejoicing on the inside especially when the prince told her they'd break up the engagement. He saw that as an opportunity, that if Emi breaks up with the prince and she becomes isolated, then he can swoop in and make it so that he's the only person she can rely on. Heck, this guy wasn't even affected by the potion! Because unlike the others, he didn't despise or felt inferior to Emi. HE STOOD BY OF HIS OWN ACCORD AND WATCHED HER BREAK DOWN BECAUSE HE WANTS HER FOR HIMSELF. He's so trash I swear.
Lastly, the musician dude. For him I don't have much information about, but he loved Emi as well. Kind of a mixed situation with the prince and the brother wherein he had inferiority complex and wanted Emi to not be engaged with the prince so he can have a chance. Overall he's also scum for being aware that she'd never do all that but turning a blind eye for his own selfish desires, so screw him too.
Like, everyone is bashing them, and I get it!
But still, they were literally drugged with powerful, mind altering drugs, because of how much they had genuinely loved Emi.
Like, we're shown how powerful demon world magic is multiple times. It can make fat disappear with a single drop and when not diluted even saggy skin can be pulled taught.
We're about to be shown that it's so powerful it can show us projections of the past.