0.5 Mm

My name is Zhai Youyou, I am twenty-two years old and a detective. Full points for business ability, negative points for worldliness. I can see through all the lies from the heartbeat, pupils, and the curvature of the corners of the mouth, but I don't understand why telling the truth makes people cry. I have two friends: a girl who has a supernatural smell but doesn't know it, and a brother who is "not a human" like me. We opened a paranormal agency that specializes in dealing with things that the police don't care about and ordinary people are afraid of. Looking for cats, catching mistresses, checking cheating - these are also accepted. After all, you have to eat. Until one day, a coin with an eye symbol appeared. The missing child, the abandoned vegetable market, the thing in the well that keeps laughing... And that 0.5 Mm smile - the smile that all dead people have. I began to find that all the supernatural beings in this world seemed to know me. And I seem to be more than just "Zhai Youyou". This is a story about how the corners of your mouth turn up by 0.5 Millimeters when you smile. It is also a story about a person learning to be a human being. It is also a story about a group of people passing each other and illuminating each other. When you laugh, your face will become sour. When I cry, there is no sound.