Chinese teacher Yan Mingke's life creed is: everything spoken by living people must be carefully studied.
Forensic intern Tang Tang's life creed is: dead people can't lie, but the truth needs to be told by living people.
The two men, who were supposed to be the future brother-in-law and the poisonous brother-in-law, were involved in a series of murder cases and were forced to form an "alliance of grudges" to solve the problem together - one reads the living and the other dissolves the dead.
But they didn't expect that the closer they get to the truth, the closer they get to a deeper conspiracy.
Who is the "missing subject" in that bloodthirsty confession?
Who is the "question maker" of this perfect killing?
Concept: When love turns into possessiveness, all that is left is absolute control over the other person.