Actually some of those "possessing body of" is really weird if we look from the POV of the family that's not the person who we new is someone else entirely that person is long gone
It's heartbreaking and I think I saw it on some manhwas
And theres like the horror take on it there's a shounen ai The summer hikaru died about two schoolboys and one of them it's not hikaru anymore it looks like hikaru has his memories and his face but its actually something else that crawled out of the woods
Theres another one not really horror idk I dropped after 2 or 3 chapters it's a manhwa shadowless night where the female character is a copy of a female knight who died this abyss shadow think takes her place I don't remember much I think the knight asked for it before dying but anyways her brother just feels the wrongness and instinctively knows that she is not his sister
a similar setting is it’s also shown in Killing the villainess, like the MC desperately tries to go back to her own world, which is kinda different with the typical reincarnation MCs we get, and while “trying to go back aka killing herself”, the people close to the original body got to know that “she” is not her and understand her and the author actually depicts the sorrow of the servants who come to know that their lady is not their lady anymore, which makes it very sad
this manga and shadowless night made me rethink of the “possessing body” trope, it usually dismisses all the emotions of “missing the contact of the original world” (you just do not have a family, friends, pets or any significant other to miss at all) and the blunt ignorance of the people around the original body who will get possessed (they just do not think that having a 180 change in character is suspicious at all and just welcome it with open arms)
there are only a few webtoons that depicts some suspicious of the sudden character change, for example The greatest estate developer, the mc lost all his loved ones and he is a loner with no friends, however he tries his best make a slow change in character after the reincarnation. His knight is suspicious and eventually we come to understanding that the knight knows he is not his original master anymore but he comes to accept the new master. With the family, MC tries to talk his way out, like he is more mature now so he behaves differently thanks to that. The parents do find this sudden maturity strange but they also accept him the way he is now. Although I think the Mc still puts some walls between them because he never called the father “father”, instead he calls him respectfully “Count” or “Master”
Like imagine if the father and brother found out that that’s not their actual Daughter/Brother. And maybe fl is actually villainess but a persons personality doesn’t change overnight