The son of a Taoist priest and a demon spirit, and a young man who bears a blood feud.
One was born against the will of God, and the other grew up in killing and hatred. They were both saved by demon spirits, and were also surrounded and suppressed by their own kind because of demon spirits.
Demonic spirits have many feelings, but there is no way in the human world. In this case, they are determined to subvert this ruthless and meaningless world.
Motto: Love can change everything