Blood demons are bloodthirsty, especially for humans. Human blood has a natural fatal attraction to them. Once they smell the smell of blood in the air, the blood demons will lose their rationality, and killing becomes their mission.
One is a cold, murderous man in the secret chamber, and the other is a kind-hearted, gentle mute. The two people, who have no relationship at all, embark on a truth-seeking path full of mysteries, dangers and ups and downs.
What's the secret hidden beneath that brutal, bloodthirsty surface? Who is the real victim?
Everything is far from as simple as it seems...