"If you took my virginity, then you need to take responsibility." Just one night. Just one mistake. And now I find myself entirely entangled in this situation—with my younger brother’s friend! Weren’t you supposed to be the quiet type? Didn’t you show no interest in girls, especially not in me? However, after behaving so uncharacteristically, Seunghyun starts to act like my boyfriend—leaving Jiwoo in a state of utter confusion. At times, everything can unravel in the blink of an eye.