Are there any webtoons where the MC is transported into a work of fiction, but has to fight someone who knows the original timeline?

I know a common premise in a lot of webtoon stories is that the MC gets isekaied into a book or show or game that they are already fully familiar with and uses that knowledge to thrive in the new world. I kinda dislike the premise to be honest because it makes the protagonist really overpowered and they usually go on to become even more ridiculously overpowered. I was wondering though, considering how common this type of webtoon is, are there any webtoons where the MC is forced to fight someone who remembers the original timeline? Not necessarily talking about someone who was also isekaied from Earth, just someone who knows the past storyline just like the MC. I think Surviving Romance would fit the bill, but I'm not aware of any others.