Yu Nianyi has a bad habit: whenever she has too much free time, she can't resist flirting with someone new. She's never been single for long. She first met Xi Yu on a snowy winter day, not long after breaking up with her ex. The breakup still stung, but when she caught sight of Xi Yu, her first impression was simply that this woman was dull and hopelessly by-the-book. Dressed head to toe in black, Xi Yu wore a tailored overcoat over a high-neck gray sweater, plain black-rimmed glasses, and spoke in a flat, uninflected voice. Everything about her seemed utterly unremarkable. To Yu Nianyi, she looked like the kind of background NPC no one would ever notice. By all rights, their paths should never have crossed. But Yu Nianyi has never been able to resist making a move.