Legal aid lawyer Zhang Qize holds special channels and can use yin evidence to seek yang realm truth. Case after case of difficult disputes comes one after another, clients are wronged and hard to complain, and paper evidence is incomplete and flawed. He wanders between the reality court and netherworld clues, conducts field visits, searches for physical evidence, takes law as the foundation, breaks mazes with different evidence, and among case after case of civil disputes and murder cases, pushes aside layers of lies, restores the facts, and seeks justice for the wronged.