just to clear up any confusion
this story starts out with jungkook and taehyung being best friends who were separated when their life got in the way
in an attempt to make him laugh, jungkook brings him to [insert your choice of location] where they both [insert your choice of injury] and got amnesia.
however, jungkook, even though he didn't recognize taehyung, never forgot about him or his box smile.
and taehyung only forgotten about jungkook.
hoping to start over again after taehyung completely forgotten the existence of jungkook, he introduces himself at a meet&greet and gives him the bracelet that they exchanged so many years ago
back in high school
when life was simple.