The poisonous industrial fog swallowed the surface of the earth, and humans were forced to escape underground to survive. {Martin} is a manager of one of the few underground ecological farms that stably produces food, carrying the hope of countless survivors. With the increase in defectors, the farm's resources are on the verge of depletion. What's even more deadly is that bloodthirsty mutant worms have begun to frequently invade the farm, leaving the farm's defense line in jeopardy. In order to find a new way out, Martin led the team to drive a modified detector deep underground. They accidentally discover a giant cave with pure water and soil, which is an ideal home. Unexpectedly, primitive underground humans who have been breeding for generations live here and regard them as intruders. There are ethnic estrangements within and worms lurking outside. Martin must break the situation - resolve the conflicts between the two ethnic groups, conclude a peace treaty, and lead the survivors to light a new fire deep underground.
