Sleepless NightHeilo's Sleepless Night; 잠들지 못하는 밤; Sleepless Night

In order to trace the culprit behind his familys murder in his childhood, Vampire Hunter Heilo accepts a kill order from a client. His target is the head of the Livera Group, Herrace. Heilo joins Herraces company, and successfully acquires a position as the personal secretary of Herrace himself, who is known for his dominating presence in politics and the underworld. However, Herraces special treatment gradually causes Heilos heart to sway What will his fate be, having fallen for the man he's supposed to kill?!