Hint: Someone who at least knows how to do magic, someone who looks like have an interest in her, and someone who's important to the story or else this event wouldn't have happened. Connect the dots and you have your man. If not then you'll know in the next chapters, probably.
Hmm... I don't know either (didn't read the raws), but maybe he's just testing her? Kinda like playing with a toy? His intentions might not be bad (probably) but definitely not good either (if you're playing with an oblivious person!).
That's what the others are saying. I ship them, too.
I think we already know who sent her that scroll.
But seriously girl, if you find something on the ground, it's common sense to be suspicious of it and just not use it without examining it, no? Who knows what it'll bring you. Good thing this is a gag manhwa, otherwise...