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Ai Wei Kessler has just switched to a homicide detective and is preparing to flex her muscles in her new job, but she begins to see some terrifying sights that cannot be explained in words. Ai Wei's mother Mary found out about this and asked her to be transferred to the police station where her cousin was, and revealed a shocking secret. The lives of Ai Wei and her cousin Nick Burkhardt changed forever. Mary said that the ancestors of the Burkhardt family once belonged to a hunter group, and their unified code name was "Green". There are a large number of supernatural creatures in this world who are trying to invade the world and destroy mankind, and the task of "Green" is to stop their plots. As Ai Wei learned more about her family's background, she became more and more aware of her unshirkable obligation to "Green". The Brothers Grimm are fake, but the Grimm Fairy Tales are true - this new discovery will not only affect Nick's fate, but also the fate of mankind...