Lin Xiao can see the "rules" - the deadly tricks hidden in the shadow of the city. When people around her disappear one after another for violating invisible taboos, she is forced to join forces with Su Jin, a female Chinese medicine doctor who carries a secret. The two discovered that the source of all the deceptions actually pointed to the Lin family's ancestral secret book that was mutilated in the war, and the "Yin Vein Eye" underground in Jiangcheng that should not be touched.
Purpose: When the rules start killing people, the only way to survive is to become a rule breaker