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Many people are probably familiar with the arguments and fights between a brother and sister. Whether they're serious or just a joke. Rina knows this all too well...even too well. She's 18, a cheerful, optimistic, and charismatic schoolgirl. She loves dancing and goes to training. She loves music, so she often locks herself in her room and listens to her favorite idols. Life isn't all that bad, except for the fact that her mother decided to find a new man, and so unexpectedly and abruptly. She justifies it by saying, "Rina, you don't understand, I've fallen in love with him." Yes, Rina is unfamiliar with this feeling; she's never loved anyone before, and has never felt even the slightest attraction. She's more for freedom, for action, for a wild drive.

But her mother gave her a gift not only by finding her a stepfather but also by foisting on her an older, utterly infuriating brother. Jungkook became her personal nightmare. He was 21 years old, studying to be a prosecutor at the country's elite Busan University. A serious type. Jungkook also loved sports, often staying up late at practice, keeping his body and figure in shape, but Rina chalked it up to "seducing girls." Jungkook was tall and handsome, a perfect model with such a pretty, lovable, rabbit-like appearance. However, she turned out to be a deceptive bastard; the guy was utterly infuriating, not boring, no. Rather, he always saw only his own rules and conditions, putting them above all others.

Even though he wasn't a biological sibling, Jungkook quickly assumed the role of older brother, being strict and often overreacting. This was incredibly infuriating. Rina, too, wasn't a gift to him, but a demon, a living devil. Frequent tantrums and teasing, Jungkook was a very disciplined guy, though he also loved hanging out, but he didn't dream of a sister who would anger him and drive him crazy every single day. Fortunately, he was studying and then going out with friends in the evenings. So, lately, they hadn't seen each other much; it had become hard for both of them to breathe around each other.

It was absolutely necessary to tease or try to somehow hurt or offend.

You are difficult, but dear.