In addition to water sources, soil, pipes... There are other unknowns hidden underground. Are those unknowns harmful to the human body?
Luoyang, together with his senior brother Di Shi and his partner Ru Lan, explore the unknown underground, protect clean reservoirs, and discover the secrets of the earth.
This book is purely fictitious, please do not take it seriously if there are any similarities.
Purpose: Protect the homeland of mankind