"If Jungwon knew about this, he'd kill me." Haein laughed softly. "Then maybe we should stop." "Do you want to?" The silence that followed told Sim Jaeyun everything. Falling for his best friend's older sister was never supposed to happen. Yet the more time Sim Jaeyun spends with her, the harder it becomes to ignore the tension simmering beneath every conversation and every accidental touch. Some stories begin with a spark. Theirs began with years of restraint. And when two people spend so long pretending they don't want each other, eventually something has to give.