In a world where humans and demons coexist, Cangcheng is a provincial capital with a large population. At the boundary between the demon world and the human world, incidents of demons hurting people often occur, so a special task force for serious cases is called the serious crime team. Affiliated to the State Supervision Bureau, it handles special and major criminal cases in the demon world and the human world. Generally, suspects who go through the serious crime team are basically wiped out by society. Si Zechuan, the leader of the serious crime team, is a person that people and demons avoid even more, and the other members of the serious crime team are also feared characters. Qi Jiu'er, the eldest granddaughter of the Qingqiu Nine-tailed Fox Clan who is good at various formations, the future Qingqiu Queen Qi Jiu'er, the half-demon and half-demon myna brother Jing Xiaohei with a weird life experience, the ancient sacred beast Bai Ze who knows the past and present and knows everything about the world, and the elusive and sinister thug Ghost King Zhao Shang. Si Zechuan is an ordinary person, but he has been riddled with evil spirits since he was a child, and his fate is extremely hard. He grew up in an orphanage and was adopted by Si Cheng'an and his wife An Ci when he was a teenager. He was renamed Si Zechuan and had a younger sister Si Tu. When the crime team was worried about a case, the State Supervision Bureau suddenly called in a special consultant, Zheng Landing. But Si Zechuan, the leader of the cold noodle team with all kinds of routines, is not as simple as he appears to be this clean boy who is carefree and cheerful all day long. He has a deep understanding of the demon world and the demon world, but he is really disdainful of God. What's more important is that as a holy beast, Bai Ze's ability to listen to the heart is of no use to him. For Si Zechuan, who is not familiar with love, he is also falling into a trap named Zheng Lanting step by step.