As humans continue to explore the world, another noble and mysterious race chooses to hide deep underground. They call themselves blood races, while humans call them vampires. Ye Bai (played by Tu Shimin) is aVampire Detective is specifically responsible for investigating cases related to vampires. He found that there had been a sudden increase in cases of vampire attacks on humans in the city of Yening recently, and just as he was about to start his investigation, he himself had also beenAttacked. Ye Bai narrowly escaped the disaster, only to find himself bitten by a vampire, and began to develop a desire to drink fresh blood. At the same time, a department known as the 'ultimate defense against vampires by humans'The organization 'Left Gate' came knocking to invite Ye Bai to join