Can somebody help me remember if this anime/manga exists or if I’m just crazy?

It’s about this recently widowed single father whose dead wife suddenly reappears, albeit appearing younger, with no recollection of their marriage. It turns out that before she died, the wife sent herself into the future (the present timeline in the plot) or some kind of timey wimey stuff. Because of this shenanigans ensue such as the man trying to make love to his wife but finding out that he took her first time due to the time travel.

I think there is a korean drama with this kind of plot. Try mydramalist for it maybe(maybe its adaptation of the manga you are searching).

It's one of my favorite drama! It's from a novel.
Be With You (2004)