Change Me! (Jeon Jungkook x Reader)

He changed and it's my fault, I shouldn't have encourage him to be this way. My best friend Jungkook was once a sweetheart, but now he's an arrogant and selfish person. He eventually joined the group called 'BTS', I thought they were nice people who would look after him, but no. They may look happy and kind to others, but behind that demeanor is something frightening. How did it come to this?