
The only one that comes to my mind that kinda fits of the top of my head is Love Interest Zone
Guy is transmigrated into a video game and resolves to make his favourite character's life (which is miserable in the original game and he really empathizes with him) happier and ends up spending lots of time with this character. But there are certain caveats that make this very hard in the beginning.
Definitely recommend it regardless of it being kinda similar. Lots of really cute vibes but gets serious at times and towards the end. There is also a kdrama it's been adapted into called Love For Love's Sake
I really really like this type of story, like when someone is stalking or paying close attention to an attractive person for a reason other than a crush. Then the attractive person thinks that person likes them by accident and then its a slow romance kind of. If there is anything like that you guys have read pls pls pls recommend it to me, it's so good.