It isn't abnormal to just sometimes feel struck by an inexplicable sense of melancholy. For Minseok, he has always believed in fate. He believes that such sudden feelings of sadness result only from the loss of someone close to you that you have not yet met. So one day, upon once more feeling that sense of depression, he learns of the death of a student that went to the same school as him, and, convinced that he and the deceased student were meant to have been together, he goes on a mission to learn everything he can about a student by the name of Wu Yifan.