Isaac, your neighbor is an immortal being. Though you don't know each other, you somehow found out because of a few accidents. Like getting hit by a car,falling down the stairs and you don't know what to think. Is it luck or is he even human?

Then one day you bumped into Isaac with his friends.

"Oh! I'm sorry. Are you alright,miss?" Isaac apologized with a worried face but still smiled. He helped you get up.