This story kind of reminds me of shining inheritance.
Both stories had the guys be obsessive towards the girls before they really liked them, and both of the stories have someone abandoned somewhere because they know some information that one else knows. Her father was abandoned and died, and in shining inheritance her brother was abandoned and then found again.
I think I have definitely experienced this several times and I had no idea what it was. It usually occurred when I watched a finished drama in 3 days or less, and then I felt like not watch another drama but that one for about at a week or two. I definitely experienced if with dream high.