In 2010, a highly decomposed male body was found in a dry well in Shanghe County, Shandong Province. Starting with a special ax, the police uncovered a series of murders caused by extramarital affairs. The case is reversed layer by layer: the hired murderer becomes the prey, the killers kill each other, and the final mastermind turns out to be the original "target". After more than two years of tracing, the truth came to light through a "death certificate" and a drop of blood.
It's very suspenseful and quite seductive.