'Taehyung sister'-J.JK FF

This story is about that Jeon Jungkook fell in love with his hyung sister. Taehyung didn't want them two to date because Jungkook was a Playboy and taehyung knew that because he was also one was as the rest of BTS. Jungkook made a promise to taehyung that he will change just to be with y/n....Do you think he keep his promise?