Under the bustling city, a series of unsolved cases follow one after another. Detective Xia Qiran, who was wrongfully resigned, forms a temporary partner with top psychological analyst Yang Wenjing to jointly investigate a series of intricate mysteries. In the journey of pursuing the truth, a small team with both justice and humor gradually uncovers the mastermind behind the layers of unsolved cases. Each branch line is intertwined with daily life, with cases within cases and mysteries upon mysteries. The darkness and light of urban humanity are revealed in multiple lines. Thrilling reasoning, intellectual confrontation and daily banter are intertwined with each other, but the truth is far more bizarre and cruel than they expected. Finally, before the tenth threshold where fate intersects, the team will face the ultimate test of how to choose between justice and sacrifice.
