The Forgotten Love

Katherine had a peaceful life, excellent grades and Michael (her best friend).
Until the day that she collided with a stranger that says that knows her.
What would you do?
You would ask him how he knows you…or…if it was only a mistake, right? That would be the normal thing to do…
But…Kath is totally different from normal people so she throws a cotton candy to his face, and runs away.
Who would be this stranger that appears to know her (strangely very well) and that transfers himself for her school?
Would he be a psychopath and a stalker or does he truly knows her…from a forgotten love?