Chen Jiuxiao, a graduate of the Department of Archeology, accidentally received a bronze ring left by his late grandfather. On the inside of the ring was engraved a mysterious map that had never been seen in any classics. He followed the clues into the uninhabited mountainous area on the southwest border and found the ruins of an ancient village swallowed up by underground fissures. Under the cracks is an isolated underground world—phosphorescent forests, upside-down stalactite cities, blind giant beasts wandering in dark rivers, and ruins of lost civilizations forgotten by time. Here, the laws of geology fail, the magnetic field is reversed, and time flows strangely. The most terrifying thing is that someone arrived before them - those people have lived underground for hundreds of years, and they no longer even look like humans. Chen Jiuxiao wants to find his grandfather's remains, but gradually discovers that his grandfather's disappearance was not an accident, but to keep the secret of the "dragon" in the deepest part of the earth.
