Me on the train

This is a train carrying 30 people's lives. People getting off at each station live or die. The notice shouted to live, but the purser reported the name of the next station... a car accident in Linze city caused 30 people to be seriously injured and unconscious. The life supporting instruments in the intensive care unit rang, and the noisy life outside couldn't help crying, The police who woke up looked for the truth everywhere, but accidentally found that the number and gender of the next station in the dream were linked to reality... reality and dream alternate. Who is the last murderer? Can death really bring relief to everyone?