Jiang Xixun has been dreaming about a man since his second year in high school. He doesn't remember his appearance or the dream, but only remembers a sentence in the dream: "My name is Yao Lei. You must remember that we will meet again." But he never thought that we met in the hospital, and after seeing him, Jiang Xixun felt that his memory seemed to be confused. He and what happened in the dream gradually became clearer. Who is he?