I love this manga so much. Intelligent main characters always make my day anyway, but a pseudo-revenge plotline? It hits everything I like in stories like this. More often than not, when a writer creates a "clever" character, they're only as smart as the person writing them—and so it results in a character with a skyscraper ego that does things that they shouldn't be able too simply "because they're smart."
Writing it this way is very clever, not just because she's able to set up events as she wants them, but also because she's using knowledge of the future to aid her exploits. It's not hand-wavy because she's literally already experienced these events before, quite a lot of times over, it seems. Aside from that, she does genuinely have the ML's best interests at heart and in mind—and it's really nice to see the ML slowly get back to how he was before. I'm sure everyone here can relate to having deep-seated regrets and wanting to change them. Difference here is that our FML actually has the ability to do that.
Overall, solid 9/10 — I'd rate it higher but we're only 25 chapters in and I've seen numerous great manga nosedive in an instant. But I hold out hope that it maintains it's pace all the way through. It's done wonders thus far.
