During the Qin Dynasty, Qin Mu ate a piece of shark flesh and became immortal and immortal. The three hundred people who tested the medicine all turned into shark corpses crawling under the water, and he was the only one who survived. His blood can quell evil spirits in the world, and his flesh can grow back even if it is cut into pieces. From Xianyang to Chibi, from the prosperous Tang Dynasty to the Republic of China, he walked for two thousand years with a broken knife on his back, collecting monsters, keeping lists, and looking for fellow travelers. During the troubled times of the Three Kingdoms, he met Su Wan - the Yunmengze Su family had fed the door with flesh and blood for generations, and she was the only one who could lock that door. Their old enemy Han has been chasing them for two hundred years and wants to use her blood to open the door. The person behind the door was already awake. Immortality is not a blessing, it is a debt. This book is about a man who can't pay off his debts.
