The song first the trailer:

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Sharon: you did what!?

A curse is made

Dan: I don't feel so good man..

Dan starts changing into a werewolf/Lycan(Lycans are basically Natural Born Werewolves that can transform at anytime of day)

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(Just the transformation part)

Ivan:wait that means.... We're not human

Ivan opens his mouth to reveal his vampire fangs

finding out the truth

Two brother born with a curse of the sin from their shitty father. Two powerful creatures of the night. One became a godlike werewolf who stoic and loving, the other who became a godlike Vampire who driven with insanity. Two brothers own the night as it LETHAL PROTECTORS