Park Chaeyoung just broke up with her boyfriend of three years, Kim Taehyung. But she did not have a clue as to why he broke up with her. So she was left devastated and miserable. While Jeon Jungkook met Park Chaeyoung when she started working at Hephaestus Furniture Inc., which is on the same building as Jungkook's workplace. He had a crush on her when they met for the first time. But it took him six months before he found the courage to befriend her. Caught in between the past and her new friend, who will Park Chaeyoung choose?