The story takes place in the urban "Fog City" in the near future. The protagonist Chen Mo is an ordinary social programmer. One day while working overtime until late at night, he mistakenly entered a subway that never stopped at any station - the Abyss Subway. This world view combines urban legends and Cthulhu elements. The subway system is a different-dimensional space that connects reality and weirdness. Each station is an independent copy of the rules.
