After a piano lesson, Miss Dou meets Cao, a new recorder teacher, and their playing quickly finds an effortless rhythm that makes time slip away. When she returns home late, her controlling husband, Nan, grows suspicious once again. At the next rehearsal, Nan’s relentless calls push Dou to a breaking point. Cao offers quiet support, and Nan, seeing only what he expects to see, convinces himself he finally has proof of betrayal. That night, the argument at home spirals beyond reason. Fueled by alcohol and paranoia, Nan kills her. From the funeral night, a fox begins to show up in every corner of Nan’s life, silent and unblinking, as if it knows.