Hanjiang Lengyue once witnessed a tragic disaster that wiped out a family. Ten-year-old Jiang Muyun, burdened with a blood feud and half a piece of jade, was thrown into the river by fate, but was rescued by an outsider and brought to the Hidden World Mountain.
During his ten years in the mountains, he didn't have just one person as his teacher. The "King of Medicine" who saves lives and heals the wounded, but can be reduced to flesh and bones; the "Master of the Shadow Palace" who controls the shadows and comes and goes without a trace; the "God of Wealth" who is rich enough to rival the country and controls the business world; the "Master of the Sect" who is a master of martial arts and powerful, and has no friends... Four extraordinary people in this world have taught each other their lifelong secrets. Medical knowledge gave him benevolence and insight, assassination skills taught him tolerance and precision, business wisdom taught him how to strategize, and peerless force became his most solid backing.
Ten years later, the young man finished his studies and came down the mountain. Carrying the tokens given by the four masters, he returned to the world of mortals like a sharp blade slowly unsheathed. He quietly established himself in the city with his extraordinary medical skills. An accidental rescue allowed him to encounter warm eyes, and unexpectedly touched the sensitive nerves of his enemies deep in the darkness.
The mysteries of the past are like fog locking the river, and new friends and old enemies are intertwined in the bustling world. Jiang Muyun managed the business world and traveled across the city, step by step approaching the truth of the year. However, when the end of revenge is close at hand, he is faced with a more difficult choice than killing: let the flame of hatred burn everything, or can he keep his heart and find the "first man" under the river moon who has not been swallowed up by hatred?
