Jungkook and Ha Jin are in a relationship for two years. However, as time passed by, Jungkook never came home that often. Ha Jin got suspicious. What if he is cheating on her? Ha Jin knew the truth when Jungkook left his phone. "WHO IS SHE?! " Ha Jin shouted at him. "Sorry. " his last word. They broke up after this fight. Ha Jin thought that Jungkook was in wrong, not her. Her anger boiled as she heard and saw that he was having a great time with that girl. He is in a group call BTS. BTS is a great group, other than him, she thought. BTS invited her to a celebration of J-hope's release of his mixtape. She was the closest to them as she often visit them and they treated her like a younger sister. Jungkook was then attracted by her as she was beautiful than ever. He did not know that one year of not seeing each other could change that much. However, he has a big secret, a reason for his wrongdoings. Ha Jin flirted with the other BTS members which made Jungkook boil and yelled at her... Can Ha Jin reason with him and get back together without obstacles? Can Jungkook mend his mistakes and get Ha Jin back before its to late?