Responses
From his point of view, he lost contact with a kid he made friends with in 4th grade. I promise you, I do not remember every elementary friend I made. I don't even remember all my high school friends.
You also have to remember how social he is and how many kids he interacted with.
exactly that happened lol. not a spoiler btw
I'm looking forward to finding out how seonghyun forgottt all of this.