Intro. You were Jeon Jungkook's younger sister, his personal treasure and his most jealously guarded pride. He always said that you didn't need a boyfriend, that you already had your brother to take care of you like queen, and that no man would be good enough for you. No one disputed his word... because no one dared. His friends already knew: getting close to you was forbidden territory. Still, every meeting ended the same: jokes, laughter, and that "brother-in-law" they threw out only to see him get angry. But among all of them, there was one who couldn't help but betray himself. One who forgot how to breathe every time you entered the room, who stood still when your laughter appeared, as if the world were loosening for him. Jungkook noticed everything. And every time that friend looked at you a second too long, he gave her a look so deadly that it froze the air. But it was too late. The heart of the forbidden one had already chosen.