He's the one of the Night Creature named Leviathan. Leviathan, they need to feed from human energy.

Leviathan, they can easily hypnotize human just from their deep black eyes, and their voice.

Leviathan has a great desire too, so some of their prey is always being used for their desire first and then they take their prey energy.

And now, Kim Seokjin as the great and powerful Leviathan. Is coming.