My all white mafian

Prologue

"Taetae don’t go..." 8 year old Jaemin sobbed as she clung onto his shirt tighter, tears threatening to fall from her big hazel eyes. Taehyung only chuckled as he held her tighter with one hand and patted her head with the other."Aish...should've known you'd make it harder for me to leave you big crybaby" Taehyung said trying to lighten up the mood which instead made her finally burst into tears.
Taehyungs eyes widened as he panicked "No no angel, don’t cry I was only joking..." she payed no heed to his words "B-but you’re going" she continued to sob. She sniffed "When will you be back?"
"Angel" he pulled away from the hug and looked at her "I want you to have this" he shuffled through his pockets and pulled something out, it was a pendant with a snowflake on it. Jaemin couldn't help but admire it as he put in on her. "Look at that it's a snowflake, very precious and delicate just like you. And just like you it's very important to me, I don’t know what I’d do without it...never let it out of your sight and never let anyone see it ok? " Jaemin looked at him with shimmering eyes and nodded slowly still dazed at his words. 
"Good" he giggled as he wiped her tears he then looked at her sadly "Goodbye angel" he said before making his way to her window but before he could climb out, a tiny pair of hands held him back "Taetae..." she was sobbing uncontrollably. Taehyung sighed as he turned to look at her.
"Angel..." she only whimpered in reply. He wiped her tears again then looked at her seriously "Make sure you don’t fall in love with anyone while I'm gone, be sure I’m gonna beat him up" "H-Huh?" she sniffed confused. He then giggled and said "Make sure you take care of my two precious possessions, I wouldn't know what to do if anything happened to them." I love you" he pecked her forehead and managed to climb out while she was in a daze. It was obvious that she was in love with the 11 year old boy.
After finally recovering, she went over to the window, she peaked and saw no sign of Taehyung .He said she should take care of his two precious possessions, yes he gave her the necklace but what was the other thing?. Jaemin was still overwhelmed due to everything that happened, her childhood crush and best friend had said many things to her that night. She was happy he told her all those things but he never told her one thing; He never told her when he would come back.     
Jaemin gasped as she woke up from her dream, panting heavily. It was the same dream she had of that night her best friend left her, how long had it been now 8 years?. She used to have dreams of that night frequently after it happened but gradually it stopped, she wondered why after a long time she was having that dream again. She looked at the time 3:37 am.she tried her best to shrug it off but she couldn't her mind drifted back to her best friend as she played with her pendant 'pfft I love you, yeah right' she scoffed at the memory 'the idiot could have at least told me when he was coming back' she pouted as memories of her childhood friend played in her head but soon she drifted back to sleep.