It's about how 2 girls get isakaid into a storyline (idk if it's story or game one) the villianess wants to get the harem ending though , wanting the prince and other male protagonist. They've both lived this storyline before but time reversed and the fl wants to make sure it doesn't happen again. So she one by one gets the male protagonists out the picture (married off, lost status, killed, etc) I rember 2 male protagonist in particular l. The prince, who fl was arranged to marry but villianess steals, gets sent off to war but gets captured and reveals their military or kingdom secrets and is dishonored or something so the brother takes the throne. And the other is some official who vows to not get married but has an assistant who secretly loves him so fl helps her get with the guy.(some aphrodisiac potion, they marry have more kids) the villianess gets sent to a nunnery and later loses her mind, turns out it's the original girl spirit who takes back her body leaving her in a mental prison .I think fl ends up with the brother plus the royal parents are pretty supportive and don't try to foolishly protect the first prince. (They rock)
Money on it now, ahyun's uncle is actually her dad. He shows alot of affection and concern for her throughout this arc. He spoils her lots, he's worried about making the wrong move that could put ahyun's life in jeopardy (remeber that hanging scene) , frequently tries to comfort and reassure ahyun during extra stressful events (caused by karma ofc , lol) and frequently involves ahyun (her safety, thoughts, etc) as a factor before making any moves. A BIL getting it with his SIL who has a kid likely wouldn't show this much consideration for a neice/nephew (and the toxic sides would disregard them entirely outside the mother's attention/view)