Five years ago you had met a boy with who you lost contact back in time and never really heard anything from him again.
Until one day a random thought came to your mind. Currently you were talking to a guy who was from your country but lived in Germany for six years now.
You remembered that back in time when you were still talking with that guy he had mentioned comething about Germany too.
This made you think, what if it was the same guy, after all it's been five years since you lastly talked to him. Back the you were teenagers, of course he would have changed.
You weren't sure only because you didn't know his name and everyone was calling him by his nickname. So one day you decided to ask him about his name and see if it's possible that it's the guy from your past.