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Bad news comes to the home of Lin Yu, the male protagonist who has just graduated. His parents died in a car accident and his sister is also missing. A year later, his little detective agency finally received its first case, and from then on, his life became no longer ordinary. He encountered a strange and terrifying black shadow, and that shadow followed him from then on. Soon, the exotic girl Mengyou took the initiative to apply for the position of detective assistant. She has a beautiful face and a graceful and attractive figure. Not only that, she has a strange ability that is different from ordinary people - communicating with evil spirits. Although Lin Yu had no need for an assistant, he still agreed. Who would refuse such a beautiful girl to assist him? Since then, the two have experienced countless strange cases. Who is the black shadow, who is Mengyou, and where is his sister? And behind this, a huge conspiracy is slowly unfolding...