There is nothing inherently wrong with "I Swear I Won't Bother You Again", but there's nothing inherently right about it either. It has a few unique traits, but they're almost so uninteresting they're not worth mentioning. It is not unfair to say that the story is aggressively mediocre. The setting is a classic villainess manga with our villainess as the FL. The summary sums everything up nicely, but don't expect this one to shatter any stereotypes or blaze new trails in tropes and storytelling. Our FL has been sent back in time after her downfall (which was... somewhat rightly earned, depending on howyou feel about the concept of generational abuse and the amount of agency wrapped up in the concept of abused children and the old idiom, 'hurt people hurt people'), and after resolving to stay out of things this time in an attempt to not be arrested and killed in the future. This plan very quickly goes awry when her sister and the prince fail to immediately hit it off, and things very quickly fall into the same story beats as a million other manga. Her plans to avoid everyone fails, she ends up drawn into a reverse-harem situation, routinely gets drawn into dealing with people she doesn't want to deal with, and life goes on.

I Swear does have a few minor novelties going for it. For one, the half-sister that was the original timeline's downfall catalyst *actually likes the FL*. The two aren't at each other's throats, and although the FL does not like her sister, she is more than civil about it. There's the time travel element, although it is so unutilized that it largely fades into the background most of the time. The Crown Prince, who the FL was originally obsessed with and who is now falling for the FL now that she wants nothing to do with him (again, we're not exactly breaking cliches with this one), does appear to NOT be the ML, although I couldn't read far enough to get through it. Instead the ML appears to be the actually well-written and likeable childhood friend, and he is someone that most people want to root for. There is a particular standout awful character in the FL's father, who is both extremely easy to hate and someone you are actively cheering to get run over by a car, despite the medieval setting.

The story has failed to properly set up any future moments, such as a big revelation or a turning of the tables on a climactic future scene. In fact, it lacks much foreshadowing at all, and while the slice of life is fluffy, it lacks any further substance. The only potential scene that felt like it had any payoff potential at all was the moment when someone FINALLY stood up for the FL to her father and gave him the thrashing he richly deserves, but even that promise lacks enough of a hook to keep the story from feeling like a meandering, plodding mess as time marches inexorably forward with no future deadline or problem looming.

The story is, at heart, an extremely basic Reverse Harem setup. All the guys want the girl, the girl doesn't realize that any of the guys at all want her... and that's it. There's very little going on AROUND that, leaving the 'which man will she eventually wind up with' (to call it 'which one will she choose?' would be an overstatement of her agency, as she seems to have no interest in pursuing a relationship with ANYONE at this time and will likely end up falling bass-ackward into an unexpected confession from one of the male leads whenever the plot eventually calls for it) to be the main hook for the story, and it's so aggressively unframed by anything larger that it makes it hard to even picture that a world outside of the romance drama that's going on exists. People barely have personalities because there's so little for them to *react to*; the setting lacks magic, there's no war looming on the horizon, the king isn't sick, there's not a struggle for succession to the throne between brothers, there's no looming future calamity, the commoners aren't in the middle of a discontent that threatens to break out into a revolution... there's literally nothing happening. There doesn't even seem to be much interest in discovering the cause of the initial reincarnation/time travel setup to begin with. Finding a single character who has a single strong feeling or opinion on any topic NOT related to the romance at hand is a hard ask, and describing people by only their personality is incredibly difficult. The manga doesn't even try and ask interesting meta questions with its setup, such as the idea of 'how accountable for ones bad actions can a child be if they were never shown how to be anything other than bad?'

There's literally nothing happening other than the THUDDINGLY boring won't-they-won't-they relationship drama, and it makes it hard to recommend unless that is absolutely your jam, because that's ALL you're getting. If that IS your jam, then you'll probably like it.