Han Seung-ah, a vampire who experiences a peculiar condition where her libido is activated by men rather than hunger, has created a serene life for herself at a company primarily staffed by women. However, her meticulously crafted existence is disrupted by the arrival of Lee Kanghyuk, an exceptionally attractive new male employee. While everyone around her fawns over him, Seung-ah is devising a plan to ensure he leaves quickly. Unfortunately, her strategies misfire, leading her into a series of increasingly awkward and dangerous scenarios, as she struggles with the temptation to bite him.