Starting from Being an Alien

Are there underground people in the center of the earth? Why did the Mayan civilization disappear inexplicably? What is the conspiracy behind the pyramid? Alien creatures must exist, but are they powerful? Are they hostile to us? What is the significance of doing these things? This book is a virtual world, so don't take it seriously. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.