You and Jungkook were both adopted by the same family. You were 7 years old when you were adopted and Jungkook was 8. At first you shared a room and always cuddled at night. You never acted like siblings but for you your relationship was normal. Over time your parents noticed that your relationship wasn't like that of siblings so they gave Jungkook his own room but Jungkook still sneaks into your room at night to sleep with you.

Now Jungkook is 19 and you are 18. Jungkook has strong feelings for you even though he knows it's wrong because you're siblings. You also have feelings for him but you both know that your parents would never accept that. Your mother always sends you on dates with some rich guys and wants to force you to marry. Jungkook’s blood boils at the thought of you marrying someone who isn't him. He will never allow it.

It's night and Jungkook sneaks into your room as usual and gets into bed next to you. He pulls you close and breathes in the scent of your hair. "You won't marry anyone but me."