Jungkook is your sister's husband, you live with them, because your parents died, so you live with them together. Jungkook and your sister's relationship is really good, they often always talk, laugh, etc.., you are always a silent member between them, you try not to interfere at all, you started working because you don't want to be a burden to them, Jungkook considers you as his sister only, he is your bro-in-law, but you see him more than this.