Dreams can be an escape from reality. On a winter day, Xu Bo visits his junior high school language teacher, then goes downstairs to Yuzi's house to listen to her play the piano and smoke his first cigarette.Li Ke went to meet her elementary school classmate,whom she hadn't seen for years. During the time she spent together, Li Ke realized that Ke Ru was in a similar situation as her；Wang went to the city where Mei Yu lives, but Mei Yu did not make it to the meeting; Song Song was Wang's junior in college.Wang wanted to go to him to seek emotional solace, but unexpectedly encountered a "nightmare". The three main characters don't know each other but have some kind of emotional connection, a kind of reincarnation in the underworld.