The Shadows of Underground World: The Uninvited Guest

There is life on the surface of earth only, that's the common misconception Dhruv had too. Unless he found a whole civilization under the ground itself. It was never his choice to go there, he just got trapped in.
There are people just like you, but they don't like guests. There is a secret organization working in shadows to make the world a better place but are they really good?
They don't like anyone finding their secret, but Dhruv had no choice. Can he come back again or will he even survive down there?