In his prime, Bai needs a soul that is not lonely to rely on. He is not hers. He's not even his. However, during Bai's confused college years, he met Shuang. They shouldn't be together, but they trust each other, embrace each other, and firmly believe that you are mine and I am yours. The various realities of society have become the most difficult to heal wounds in each other's hearts. Does Bai choose to face this indisputable fact, or choose to move forward with Shuang?