A boy who lived nearby when you were young, who you walked to school with and played in the park with. However, due to family circumstances, the boy went away somewhere.

At the time, neither of you had smartphones and there was no way to contact each other, so the two of you never met again after that.

12 years later, your mother suddenly hands you a concert ticket. She tells you that you don't need to look up the performer, just go for now. The performer at that concert is...