Proven Wrong

Despite her, not-so-in, but very out beauty, Yu Jimin had never dated anyone. By no means, she was not a bad person, simply too guarded to let herself be dumb for love after experiencing it second hand from her mother and sister who repeatedly got cheated on. But that caused her to keep having doubts about people, always so full of suspicions with everyone around her.
But one day, when she saw her soon to be brother in law, with an attractive woman, looking too close together, her usually correct, horrible thoughts were proven different by the time she spent her days trying to find out more about the woman in question, as stubbornly denying to herself, that she had ended up unstoppably falling fast and deep for her instead.
Having to figure out herself all over again was already difficult for Jimin without having to help her, possibly most definitely, first love to find herself again, but guess she wasn't as smart as she thought she was.