Do-sik discovers that Woo-hyeol is a vampire and tests In-hae, who unexpectedly protects Woo-hyeol. Woo-hyeol, troubled by the fact that he needs In-hae's blood to survive, faces additional challenges when Hae-won becomes more affectionate towards him. Desperate to obtain In-hae's blood filled with love, Woo-hyeol's heart is tormented.