You and Taehyung have been friends since childhood.. He was your neighbor... and you both decided to get married when you grew up... but unfortunately you and your family moved... and you have not been able to communicate with Taehyung since then

You have become 20 and Taehyung is 29

While you were returning from work... you saw that someone was moving in front of your home... This reminds you of Taehyung