In 2067, the earth is on the verge of collapse. After years of destroying the environment and climate, mankind has paid a terrible price: forests, plants and wildlife have disappeared, and humans will soon perish due to the sharp reduction of available oxygen. In this gray, dying world, people live with synthetic oxygen breathed through masks, but even so, more and more people are getting sick and sick. In the absence of a cure, the only hope for mankind is the future, hoping that people will be alive in the future and can tell them how to save the planet. At this time, Chronicorp, the world's leading oxygen supplier, took the lead in carrying out the research project. One day, they will receive a message from the next 400 years: "send Ethan Whyte".
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