German tennis coach Jupp Gnabry meets Korean national tennis player Son Rayeon at the Olympic village. Yuf, who plays a practice match with Rayeon at her request, begins to take an interest in Rayeon, whose play gives him a feeling of déjà vu. He becomes more concerned about Rayeon, who shows passionate affection and a strange obsession whenever they meet in the athletes' village. Yuf even lets Rayeon, who comes to his dorm, into his room...