My childhood bestfriend BTS JUNGKOOK

[READ HERE FIRST BEFORE ENTERING THE BOOK IF YOU DON'T THEN YOU'LL WONT UNDERSTAND THE STORY]
You are Eun ae hyungsik [IM SORRY I DON'T KNOW ANY NAME ;-;] you are 18 years old when your 5 you had a playmate named ??? He was your crush i guess you two has the same feelings he moved away from America because his mother were dating another man in Korea and actually the mother was half american and half korean his father cheated on her mother which both of them are half, ??? Left you a letter so you could remember him but you forgotten him and he forgotten you but the letter is still with you you brought along in Korea the initials of the letter name was JJK and you never remembered it anyway you have a new life to start! I copied some words from other author so mianhe! Credits to them ^^