The White-Haired Demon Master

Those who are extremely vicious and devoid of humanity are referred to as "human fiends"

Those who are worldly-wise and deeply understand human relationships are referred to as "human spirits"

The fierce and malevolent, those who kill indiscriminately, are referred to as "human slaughterers"

Thus, those who act with cunning and craftiness, possessing intelligence akin to that of a demon, are referred to as ... ...