Bitten by a vampire guy, the half-vampire Ha-rin must hold back her craving for human blood for 30 days to return to human, or she'll be a monster forever. Only Cha Do-hyun's kiss can save her from this curse, but behind him also lies a tragic secret. 500 years ago, his first love was taken away by the wicked Moon Spirit. Ha-rin is now at a deadly crossroads between normal life and eternal love.
