A political drama set in Joseon dynasty about two relationships that fate has set in a tragic path, yet they fought against all odds.

A mosquito from Transylvania finds its way to Seoul where it bites Na Do-yol, a corrupt police officer. Soon after he begins to develop a thirst for blood, and finds out that he has vampire super powers whenever he becomes sexually aroused. When Do-yol's past misdeeds come back to threaten his partner and girlfriend, he decides to clean up his act and sets out for revenge.