Author's note: I often hear novel readers discussing who is the final male protagonist. . . However, as a heroine, she may not be able to know which of the people in her life is her hero. In fact, what I want to say is that for everyone, only themselves are the protagonists of their own lives. What I am about to write, I don't know what it is yet, will be from the perspective of the heroine, who is a passerby on a short journey, and who can accompany her all the way to the end. I am as confused and unknown as she is, and I am making difficult choices like her. I am not the controller of her destiny, but only a witness of her life.