he is your brother in law, you are married to his older,brother Jimin .you and jimin were forced to marry eachother. While your husband was away for some work, jungkook knocked on your room's door (btw you, jungkook(your brother in law), your mother in law and jimin (your husband) live in the same house)

Even though you and Jimin were forced to marry each other you two love each other a lot