Solar flares tore apart the civilized sky, and supernatural beings awakened from the abyss. Humanity struggles to survive in the ruins, while a lucky few gain the power to live in symbiosis with the supernatural - at the cost of their sanity, or humanity. Chen Mo is an orphan who grew up in the Gray Realm. There are two parasitic monsters in his body that should not coexist: one is the dark purple shadow of the old ruler, and the other is the ancient strange beast with five tails and red scales in the Book of Mountains and Seas. Twin symbionts cannot theoretically survive adolescence.
He lived to be seventeen years old. When the hunters from Iron Wall City followed the scent and came to the door, and when the words "double symbiosis" once again became the forbidden fruit coveted by all forces, Chen Mo realized that what was written in the old notebook left by Lao Luo was not a survival guide. From today on, who has the final say in this wasteland where the past is intertwined with mountains and seas.
