Kim Min (Kim Myung-Min) suspects vampires exist in Joseon and seeks information. One day, he is requested to investigate a serial murder case on Kanghwa Island. There, bodies are found that are burned to death. On the island, Kim Min and his partner Seo-Pil (Oh Dal-Su) run into a beautiful woman (Kim Ji-Won) with incredible strength. Kim Min believes she may be involved in the case. The woman tells Kim Min that she has lost her memory and doesn’t even know her own name. Kim Min needing her strength, asks her to help him investigate the murder cases. With a clue left behind on a dead body, they try to figure out who is the next target.