A junior in university, Yu Sheng's, daily priority is to make herself a person with no presence, friends, or love, insisting on refusing any social interaction. She only knows how to bury her head into creating horror novels. Until... her new neighbor, a freshman in her school's physical education faculty, moves in next door. Her junior brother Lu Haoming keeps chasing after her every day, sweetly calling her "Senior Sister", which makes her life change drastically! Senior sister: Do... Don't come over here! Junior brother: QAQ, am I not your cute junior brother anymore?