Which age gape ??? Cause iirc she wasn't very far from the ml in age, they just met when he was young and it continued for years until her death, enough time for him to be infatuated and to have a pendant of her portrait. She died for 10 years and came back in a 26 yo's body, at most the age gap between her body now and the ml would be 5 years? You consider that a questionable age gap for adults past the 25th year in ther life?
she died in her late twenties to early thirties, she knew him to some degree but wasn't too close, he was crushing on her then in his teens. now, her daughter has completely grown up, so he would around the age she was when she died. it is a tiny bit questionable since she knew him, to a degree, when he was young, but tbf she didn't really remember until recently and he has no idea either.

The story is not my type
And I don't want to see any male lead in this manhwa
It should have been only mother and daughter story
And even though she changed body
Their age gape is ........
I'm dropping this
(〜 ̄△ ̄)〜