In this world, folk taboos are real.
You are not allowed to answer names when crossing the bridge at midnight, you are not allowed to look at your wedding dress in the mirror, and you are not allowed to do mundane chores in the dark day and night - every taboo is a visible "thread" wrapped around people, objects, and days. Those who violate taboos may lose their souls at the least, or die violently at the worst. Mortals can only survive by carefully observing taboos, but some people rely on these rules to kill people and make a fortune.
Shen Yan, a young man who kept the lights, suddenly died of seven members of his family in one night. The government closed the case with eight words: he collided with evil spirits and died suddenly after violating taboos. The whole county regarded him as a broom star, and the clan elders wanted to sink him into the pond to get rid of evil spirits.
Above the mourning hall, in a desperate situation, he opened a pair of eyes that could see "taboos" - seven corpses, each with a red thread nailed to its body and mind that did not belong to any natural taboo.
His family members did not die for violating taboos. Someone used taboos to kill their whole family.
From that night on, while others hid from taboos, he read taboos, accepted taboos, and used taboos - turning the rules of murder into a knife in his own hand one by one, following the red line to recover the blood debt one by one.
People in the world survive by observing taboos. He earned his living by breaking taboos.
