A next day came and Karina lazily dragged herself to the bathroom to do her usual morning routine, she got into her school uniform and went downstairs to eat a little bit of food with a glass of water.

"Eat more child". said her mother.

"Mum are you trying to make me fat?" Karina asked her.

"No... But it worries me that you might end up getting sick". she replied all worried.

"I'm fine mum so you don't need to worry so much about me". she replied with her blunt tone.

Karina then got up from the dining table to take her leave to school, Jungkook came out of his bedroom nicely groomed and opened the door to Karina.

"Thanks, bye". Karina said without looking at Jungkook.

"I'll be taking you to school from now on". said Jungkook as he grabbed Karina's wrist.

"I'm old enough to take care of myself". Karina answered back.

"I don't care on how much protest you make I'm still taking you". he replied as he pulled his sister to his car.

It was a quiet drive and it was making Jungkook crazy he harshly pressed the brake.

"What's with you?!" he yelled at her.

"Nothing". she replied.

"Do you even hate your oppa?" he asked her.

"No". she replied.

"Do you love me then?" he asked her as his heart started to throbbing.

"Yes". she replied.

"Then you see me as a man, right?" he asked her as his hopes was super high.

"What kind of dumb question is that? Are you 2?" she slapped him around the head leaving him shock.

"So you just see me as your brother". he deeply sighed in disappointed.

"Well of course, your dad married my mum technically you are my brother". she reasoned out.

"What if I told you that I love you more than a sister... what would your reaction be?" he asked.

"Ew... that's incest bro". she replied with a disgust on her face.

With that Karina got out of the car and quickly waved at her brother and met up with her school friends then went in the school building. Jungkook just watched them all walk away and he drove away and went to a hill let out his fustration where no one is around to hear him scream. He is heart broken by his step sister and he can't help himself that his feelings keeps on growing. he sat on a large log remembering the sweet and innocent Karina he once knew.

~FLASHBACK~

Cherry blossoms were flowing smoothly and there stood a beautiful girl with the most beautiful smile and a handsome high schooler stared at the girl from a distance.

"Oppa!" a 12 year old Karina waved at a 16 year old Jungkook.

"Hello Karina!" Jungkook waved back at her.

When Karina was 3 her mother married Mr Jeon who is the father of Jungkook who was 7 at the time, Jungkook saw his little step sister grow and each year Karina blossomed by the time she was 12 Jungkook would stare at her in awe because her beauty was no joke it made his heart skip a beat. One night his father came into his bedroom that he need to speak to Jungkook over an important matter.

"Hey son need to speak to you". Mr. Jeon spoke up.

"Sure dad, what is it you need to speak to me about?" Jungkook replied & asked.

"You know you're the only one to inherit the Jeon Enterprise". said Mr Jeon as he sat on the bed with his son who was also sitting on the bed reading Marvel's Iron Man comics.

"Yeah I'm fully aware of it because you keep on telling me this since I was 12 years old". Jungkook replied.

"Well son, next year you'll be moving to Busan". Mr Jeon dropped the bomb.

"What?! About my studies?" Jungkook exclaimed in shock as he asked his father.

"Don't worry I've transferred you to another high school of business in Busan where you will be able to learn the business of Jeon Enterprise". Mr Jeon replied.

A year after Karina turned 13 in August 31st and Jungkook turned 17 on September 1st, it was the last time that he saw the girl he is his first love.

"Karina I promise that I'll come back to you". he said as he stroke Karina's cheek gently.

"Nae oppa make us proud". she smiled at her step brother.

"Study hard kiddo". he ruffled her hair.

"Yah stop messing my hair I need to look good at school". she giggled.

"You're too young to have a boyfriend you rascal". he smiled at her.

With that Jungkook left Seoul to Busan to learn business at the same time dealing with the Jeon Enterprise.

~END OF FLASHBACK~

Jungkook's tears started to escape from his eyes and he couldn't control them no longer he was far too hurt that his step sister already have rejected his love for her (a/n: she doesn't hate Jungkook... She just doesn't feel the same way as Jungkook does, the boy is in love with his step sister... unrequited love sad life). He already spoke to his father about his feelings he has been building up. Of course his father was worried that it might give Jungkook a bad image because Karina's surname is Jeon so he told his son that it will cause a scandal and destroy the company.

"Father what else can I do?" Jungkook asked his father.

"Just try to forget her and the way I see it she only sees you as her brother which is the harsh reality to see it but she's doing the right thing". said Mr Jeon.

"I'll try". Jungkook deeply sighed.

Mr Jeon then went to head to his company leaving a man who is madly in love with his step sister.

'This is going to hard to forget her and a long process too'. he thought to himself as he just sighed.

He looked at the clock on the wall and knew that his step sister finished school and he drove to the school and saw no one was there, he got out of the car and went inside the school building as he was walking in the dark corridors he heard a voice of a girl ordering people around he went to peek and saw Karina standing like a boss. He went inside the room where everyone was in and tapped Karina's shoulder.

"Oh hey". she informally greeted.

"I came to pick you up". he said.

"Oh we finish at 8 pm today". she replied busily.

"Bwo?!" Jungkook replied with his eyes widen.

"Yah! TaeTae anything yet?" she shouted across the room.

"No yet!" Taehyung shouted back.

"Jimin!" she called out to Jimin.

Jimin was quiet for a moment and looked at Karina with a scared face expression that made him look like he saw a ghost. Karina went to Jimin to see what made him like that and that's when she saw a young girl wondering around the streets alone since the streets has CCTV they are able to.

"Jimin keep an eye on her". she spoke up.

"Nae". Jimin replied.

Karina took out her phone and plugged onto the big speakers to put on music and pressed the play button which was a group called Bangtan Girls latest song Blood Sweat & Tears (a/n: Did you all see what I did there ^V^).

Jungkook looked at Karina working really hard on a serious case of the Madeline McCann disappearance he just titled his head on how she will solve the problem.

"Why looking this old case?" he asked her.

"Because that way I can track down kidnappers that are known as a pedo". she replied.

"Yah you're kid too". Jungkook complained.

"I may be a high schooler but I'm not weak than you think". she rolled her eyes.

"Have you ever fallen in love?" he asked her.

"No. Why do you ask?" Karina replied as she cocked up a brow.

"No just asking since I have a really attractive sister that I thought to myself she must have a boyfriend in secret". Jungkook tried to test Karina.

"I already said this before I don't have time for boys but however the only time I do have is to listen to my ultimate bias group". Karina replied with a serious expression.

"Who is it?" he asked feeling jealous.

"Bangtan Girls". she replied.

"That girl group?" he asked her with widen eyes.

"Yes the girl group who are breaking records with their WINGS album". she laughed.

"So you're an ARMY then". he deeply sighed.

"Do you have a problem than I'm an ARMY?" she glared at her brother.

"Yes a matter of fact I do, you should be focusing on your studies not on some girl group". he scolded.

"Yah I'm 10 times smarter than you". she sassed.

"Bwo?! Yah take that back you punk!" he widen his eyes.

"She's right Jungkookie she out smarted of us out". said Hoseok.

"Yah how come you're still in school?" Jungkook asked him.

"Well it's a long story you see all of us here except Yeri and Karina failed in many of the school entry so many times before". Jin replied feeling ashamed.

"But this brat keeps on getting top grades in every exams". said Taehyung.

"Yah do you like her?" Jungkook asked Taehyung.

"Aniya I just see her as a dongsaeng >.< plus I already have a girlfriend which is Irene n_n". Taehyung replied as he pulled Irene to his side.

"So is everyone dating?" Jungkook asked as he rose a brow at everyone.

"Some of us are, you see Jimin and Wendy are dating, Jin is dating Joy and I'm dating Seulgi". Hoseok replied to Jungkook's question.

"Amber, Namjoon, Yeri, Yoongi and Karina are still single". said Joy.

"Yah Jungkookie have you already got a girlfriend?" Amber asked him.

"Ah no". Jungkook shyly replied.

"Sad life". Karina sarcastically spoke up.

"Yah! Why are you being so rude to your oppa?!" Jungkook felt so hurt that cried out to his sister.

"My heart bleeds for you". Karina replied with more sarcasm.

"Yah which one of you taught her to be so rude?!" he asked while exclaiming.

"No one she self taught herself". said Yoongi with a sigh.

"She no longer is that sweet girl you once knew Kookie". said Jimin.

"yah oppa haven't you observed how strong Kairan-ah have become". Yeri nudged Jungkook on the arm.

"Nae I have and it's really scary". he replied.

"She's also an expert in marital arts". said Irene.

"Really? What belt is she?" Jungkook asked in surprise.

"Black belt". the whole gang sang.

O-oh I see she's capable of breaking someone's arm haha". Jungkook nervously laughed.

Jimin then looked at the screen and squinted his eyes and then his eyes widen.

"Karina! I think you should come and have a look at this!" Jimin yelled across the room.

Karina rushed to look at the screen and saw the same girl who looks like the same age as her in front of the high school where everyone are.

"GUYS LOOKS LIKE WE HAVE A NEW CLIENT!" Karina shouted.

"Okay!" everyone sang.

"Okay Yoongi, Amber, Taehyung and Irene team up and meet up with the girl who is basically standing in front of our high school". Karina snapped her fingers.

"Roger". they replied.

"Jimin! Wendy! check all of the CCTV of any suspicious movements". Karina ordered.

"On it!" Jimin and Wendy sang.

"Okay babies it's time to play". Karina smirked at her weapons she has in a storage box.

"Yah why do you even have these weapons?" Jugnkook asked as he pointed to the nunchuks.

"Well I have them just in case if shit goes down". Karina replied.

"Yah wait up for me!" Jungkook shouted and followed his sister.

"Are you sure you wanna join in the fight? There will be blood". she smirked.

Jungkook froze on his spot and he never felt fear in his life and seeing his step sister on how much she has changed scared him... He really misses the sweet girl that he left years ago when he left for Busan... What really happened to Karina and what made her change?