On a snowy winter night, Leng Zhishan encountered a boy molesting a girl on his way home. He wanted to act bravely out of justice but accidentally killed the girl. After some ideological struggle, he decided to surrender and plead guilty. When he rushed to the door of the police station, he received a crying call from his mother - his six-year-old daughter had just disappeared. The only clue left by the murderer was an ice cream stick with the word "leech" written on it. Leng Zhishan was like a bolt from the blue. After a painful struggle between justice and family love, he chose the latter and rushed back to the crime scene to take away the murder weapon. After that, Leng Zhishan embarked on a journey to find the murderer. In this chasing game, he met Ni Ning, a Feng Shui master who had the same goal as his, and Qiu Kexin, a murderer. The three people with different personalities joined forces because of the "leeches" and carefully planned to lure the "leeches" to the surface. But when they get closer to the truth at the last moment, they realize that in this suspenseful world, everyone is the source of sin that they cannot bear. Where there is a cause, there is a result, and there are no innocent people...
