true. Cleo did some bad stuff but their world is dog eat dog, they all are trying to survive. The Biggest problem is the Emperor, he decided to marry cleo, he decided to force second empress, He did not raise any of his child properly.
I think Cleo killed her stepsister in the past which is very wrong but it's not proven yet and just a possibility.
True, and I really don't like the male lead, I hate his guts, he's so much of a hypocrite, how can they offer love to Bibi and not to the Mc before she regressed? He had the power, much more than the fucking empress and the prince Brian, he Just didn't care AT ALL ABOUT HER, not a little bit, he's full of excuses.
Anyone can see in a single glance that she was being mistreated.
Oh, right! It was mentioned so briefly that I forgot about it, but you're right, it does seem to be hinted at that she killed her stepsister (but, as you said, there's no proof yet). Which would be horrible if it turns out to be true, of course, and something she absolutely should be punished for if it comes down to it, but as for the other things she's done so far in the series, most of them haven't been too bad initially, and the bad stuff that happened because of them were all unintentional on her part and, to be fair, stupid and ignorant of her.
But yeah, the emperor is...ugh. He's awful as a person, the way he acts so entitled to everything and everyone, and I can't imagine he's much better as an emperor towards his people either. Even Brian would be a better fit for the throne than him right now, even though we don't know very much about him yet.
To be fair, I think we need to remember that Titania did treat the ML rather horribly in the first timeline and hurt (even though it was accidentally) Bibi, the person who first helped him open his heart and make his family brighter. Yes, Titania absolutely loved ML in the first timeline and he absolutely should've been kinder to her and at least tried to see past her actions and figure out how mistreated she was, but at the same time, the way Titania acted was...I think, a bit stalker-ish and obsessed and I think anyone would want to keep some distance from a person like that, so I can't entirely blame him for acting the way he did. We also don't really know enough about what he was like and what he was thinking in the first timeline, so it's entirely possible that he did care about her a little, but had to treat her like the enemy because she was part of the imperial family.
I'm not saying I disagree with you, though, he definitely should've treated Titania better no matter what, but at the same time, I kinda understand why he wouldn't. I'm just glad to see that things are changing between them both in this timeline, though I hope ML will give Titania space and let her figure out her feelings and thoughts at her own pace instead of forcing her to keep this engagement that she's clearly stated that she doesn't want anymore.

Tbh I kinda like Cleo and Brian??? Sure, Cleo schemes and does some messed up stuff, but somehow I kinda find her hard to dislike because she seems to genuinely care for her son and want the best possible future for him as the emperor. And I don't really know enough about Brian to have a proper opinion on him, but so far he seems pretty...okay? Kind of pampered and spoiled and a bit stupid, but not too terrible of a person compared to other characters like him in other series. (Also I did feel a bit bad for him being chased by the magical beast somehow ;u; )
Anyway, I'm guessing Cleo and Brian will become worse as the story goes (as is the usual thing for these kinds of stories), but I really, genuinely hope not. And I lowkey kind of want Titania and Brian to form some sort of sibling-relationship even though it probably won't happen. ;u;