There is madness and truth hidden in the sea fog in Cangnan. Lin Yan, a taciturn Cangnan native, was imprisoned in the "Fog Courtyard" near the mountains and the sea because he could see filth that ordinary people could not see. He did not argue with the world or join the night watchman organization. He only held the rusty hatchet left by his grandfather and silently killed the old pollution that invaded the world in the silence and madness of the mental hospital.
With no skills to inherit and no comrades to accompany him, he relied on his natural intuition and ultimate sword skills to become the ceiling of strength that no one knew. The sea fog is billowing, and strange beasts are causing trouble. When the night watchman is helpless, this boy, who is regarded as a "madman", has already brandished a knife in the fog, guarding the peace of his homeland in a lonely manner. There is a sharp blade hidden in his silence, and underneath his madness, there is a god-killing legend unique to Cangnan.
