Hao Huigui, a 37-year-old university teacher, was unhappy with his life and work. In his dream, he returned to his 17-year-old self and met his former self. In the dream, he experienced an unforgettable time with his former self and his former partners. In this dream, he wanted to change his former self, make up for his regrets, and live his life again, but he didn't expect to be changed by his friends. After waking up from the dream, he decided to change his life.