Jimin was afraid of Jungkook especially after witnessing him kill someone. Jungkook keeps Jimin locked in his room, giving him freedom around the house only if someone was guarding him. Jungkook never tried to touch Jimin which made the smaller feel a bit safe - already starting to believe that Jungkook kept him here because Taemin's brother might come get revenge on him, not knowing Taemin never had a brother to begin with