Li Hao was an undercover agent for the Chinese police in Country H. During a mission, Li Chang Hai discovered his identity, and he fell into the sea. After being reborn, he found himself in a secret chamber, facing a man named Gou Fou, the chancellor of Yongcheng, who was now his master.
Only then did Li Hao realize that many people just like him, known as drug men, were being held there. Gou Fou kept drug men to kill for him, all to satisfy his ambition to rule the world. To achieve this, he colluded with eunuchs and courted powerful officials.
Li Hao was injured during a mission and rescued by Yin Yuexi. As it happened, her master was Nie Huai, the greatest poison doctor in the land. Though renowned for his unparalleled skill with poisons, Nie Huai was also the finest physician alive.
Li Hao had been taught since childhood that his face was hideously disfigured. He had never removed his mask in all those years, and was known among the people as the Masked Killer. But when Nie Huai treated him, he removed the mask, and the truth about Li Hao's origins gradually came to light...
