Two male leads; the tags can no longer be changed. The two begin by testing each other and clashing over their differing views. As they gradually develop an understanding while solving cases, they become confidants and comrades who fight side by side. They face more than just complicated cases: murders disguised as accidents, serial killings involving local criminal forces, and the shadow of court intrigue. Factions battling for power interfere with investigations or fabricate evidence to bury the truth. Lu Jin faces a crisis of trust because of his modern knowledge and is even accused of spreading heretical ideas. Song Ci, meanwhile, repeatedly clashes with corrupt officials and powerful families as he works to cleanse the bureaucracy, facing life-or-death trials time and again.
The clash between modern forensic knowledge and ancient criminal investigation sparks breakthroughs in solving baffling cases. Collusion between local criminal groups and factions at court weaves a vast net to obstruct justice. In this thousand-year struggle to uphold justice, Lu Jin gradually lets go of his attachment to the modern world and puts down roots in the Southern Song, using science to cut through the fog. Influenced by Lu Jin, Song Ci broadens the scope of forensic examination, gaining invaluable experience that will contribute to the creation of The Washing Away of Wrongs. With evidence as their shield and their original convictions as their spear, they cut through the obstacles of corruption and political intrigue in an age rife with miscarriages of justice, writing one legendary chapter after another in the fight to clear the names of the wronged.