The sclasses that I raised
If you're okay with novels, here are some Isekai BLs although the MCs here aren't exactly 'assholes' because they were isekaied into the bodies of the original villains. Instead, they try to avoid their own tragic endings by being kinder/avoiding MLs:
• [Guideverse] MC is isekaied into a novel as a villainous S-class Guide who likes S-class Esper ML and makes life difficult for original F-class guide MC (ML becomes extremely obsessed with MC instead of the original MC): https://cherrymist.cafe/story/how-the-guide-escapes-the-obsessive-lover/
• [Age gap and gangster/debt plot] MC is isekaied into a novel as a villain who likes the novel's original ML and bullies original MC because of it (both original ML and original MC end up falling for him instead): https://springofromance.com/story/the-villain-doesnt-want-to-be-noticed/
• [Adopted brothers] Not regression but MC realises he's a villainous character in a novel pining for the novel's original ML and making life difficult for the novel's original MC (MC ends up with his adopted brother; original ML and original MC are actually the 'villains' here because they were both mean and problematic): https://springofromance.com/story/after-the-little-cannon-fodder-was-spoiled-by-the-rich-boss/
Something similar like A Guide Out To Succeed!
not exactly similar, just asshole mc getting regressed and fixing their past mistakes towards their loved ones..