Cheat on Cheaters (KNJ, KSJ, MYG FANFIC)

episode 5

Yus-Na was a bit disturbed but she decided to gather courage and happily go to her husband and make love with him, she climbed the stairs to their room and sat beside him looking at him with all the love she had in her heart for Jin , she tried to hold his hand when
Seokjin: What are trying to do Yus-Na, you seriously have no conscience!
Yus-Na: what do you mean Jin! Why ? Why do you get irritated everytime I'm around! I'm just trying to give you some love, what's the big deal!
Seokjin: I don't want to be loved right now! I've always told I'll come to you myself when I want to!
But you always have to barge in my private space and be all lovey dovey everytime! what are we teenage lovers!?
Yus-Na: You'll come to me when you want! You'll touch me when you want! What am I jin ! A toy that you keep playing with? (Tears flowed down her cheeks)
Seokjin: You know what, I have no time for your dramas right now, do me a favour and get out of here and do whatever you want! I've had enough of you ! ( And went busy looking at his laptop)

Yus-Na left the room crying, with the broken heart she didn't want to stay in that house itself so she went out...
Meanwhile, Seokjin was alone at home. He opened his laptop and opened a folder,in that folder all of his and See-hi's Pictures from highschool were saved. He looked at those pictures and thought about how everything changed...
Back in highschool Seokjin, See-hi and Yus-na were best friends but for Seokjin See-hi wasn't just his best friend but owner of his heart and soul. He was bit older but still used to hangout with these two. He wasn't just funny back then but was the heart throb of the School, Seokjin always wanted to propose See-hi after highschool so that he could be successful and be happy forever with her. See-hi was smart and bold... even though no one dared to talk to her or disrespect her... Yus-Na was bullied, she was always the sweet and cheerful one, her personality was bright and she trusted people too well... Once a boy from another class bullied Yus-na, she wasn't somebody who could fight back, When See-he got to know about this she was pissed, it didn't even took a second for her to kick his balls. Seokjin heard all this from his classmates and went running to See-hi to see if she is OK.
Obviously she was fine but the guy who bullied her best friend wasn't . Seokjin saw Yus-na and See-hi sitting under the tree in school premises.
He went to See-hi and sat on his knees to ask her if she was OK . See-hi responded with a gentle smile that she is OK and looked at Yus-na who was all red and tears were rolling all over her cheeks, she was crying because she thought all that happened because of her, she was an innocent and a simple girl. See-hi then signalled  Seokjin to comfort Yus-na, Seokjin hugged Yus-na and he made her laugh with his dad jokes. She fell for him at that moment without knowing about the feelings Seokjin had for See-Hi....
(This was their past)