During military training, Lu Qingyue mistakes Cheng Xingye, a senior medical student, for a womanizer, leading to a series of hilarious misunderstandings. She is constantly at odds with her older brother, Lu Yi, and gets into trouble for arriving late to training, sneaking over a wall for food, and getting hit by a basketball, all of which bring her into repeated contact with Cheng Xingye. As they continue to cross paths at KTV gatherings and amid a Christmas Eve confession scandal, Lu Qingyue gradually falls for Cheng Xingye but struggles with her feelings because of rumors circulating around them. After final exams, she gets her brother a gift but makes an embarrassing mistake with the size. During winter break, she accompanies Lu Yi to Cheng Xingye's birthday party, where her emotions fluctuate. Cheng Xingye later takes her shopping and buys the dress she has been longing for, and the romantic tension between them continues to grow.