Park Chaeyoung has a heart condition. Due to this, she easily gets tired and stressed out. So her family became overprotective of her, most especially her big brother, Park Jimin. ... ... ... ... ... Kim Taehyung and the rest of his dance club members were planning to attend a dance camp during summer break. Unfortunately, Taehyung injured his arm a few days before the break. He was saddened being unable to attend the dance camp. For his recovery, he stayed in his hometown, Daegu. He was already starting to accept his miserable summer until he met this charming young lady. She transformed his dull summer into something bright and full of fun. ... ... ... ... ... "Before you even think about it, I'm warning you guys . . . my sister . . . she's off-limits," Jimin sternly said. Taehyung and Jungkook just scoffed in response. "Oppa!" Taehyung was shocked to hear that familiar voice. When he turned around, he found her standing a few feet from him. He was about to take a step forward when Jimin popped out from behind him and ran towards her. "Chae! Where have you been?" Nooo! She. Can't. Be . . . off-limits.

Unknown to the two of them, Jungkook and Chaeyoung started liking each other back in high school. But neither of them made a move until they went to college and enrolled in the same major at the same university. They became good friends. And when Jungkook started acting on his feelings for her, Chaeyoung found out that she was to migrate to Australia with her family. So despite finding it difficult, Chaeyoung chose not to allow things to escalate any further and left Korea without clearing up things with Jungkook. It took Chaeyoung seven years before she came back to Korea to work in a magazine company along with her best friends. And she previously thought that seven years was long enough. But when it came to forgetting Jungkook, she realized that it wasn't enough at all. She didn't understand why her mind kept on coming back to him even after all those years. Her what-ifs were only adding up each year. However, she wasn't planning to rekindle anything with Jungkook. Feeling guilty of her previous actions, she didn't want to compromise him even more. However, Jungkook had a different plan. When he met Chaeyoung again after she'd gone missing for seven years, he was determined to carry on their intercepted love affair. Although it didn't seem too easy when he realized that a lot of things had changed along the passing years. If now was not yet the time for Jungkook and Chaeyoung, perhaps SOMEDAY SOON?

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?