In a gang world full of violence and betrayal, the protagonist Li Tianyu is a ruthless gang boss. In an accident, he met the amnesiac AI robot "Luna" and took her home without knowing it. As Luna gradually regained her memory, Li Tianyu discovered that she not only possessed super combat power and intelligence, but also hid a deadly secret. The two gradually developed emotions that transcended the relationship between master and servant, but when the truth was revealed, Luna had to face her original mission, and Li Tianyu also had to make a choice between love and survival.