The Town Has New Rules Every Night: the Night Watchman

Shen Budu is the watchman in Huaian Town. This town is located at the junction of Yin and Yang, and there have been rules at night since ancient times - and they are different every night. Don't answer the third cat meow after midnight; don't answer the door after midnight; don't light the second lamp when the fog starts... The rules are written on the watchman's clapper. If he breaks the rules, he will go to the town to accompany those who refuse to leave. It has only been seven days since Shen Budu took this job. The master died under the roots of the old locust tree, leaving only three words: Don't look back. My younger sister Ah Ruan was half-soul-stricken by "Zi Shi Cry", and she cried nearly an inch every night. He had to figure out the rules of crying at night before her soul was wiped out. He can "listen to bones" - when he touches dead objects, the bones will tell him the cause of death and unresolved obsessions. So he solved old cases one after another, understood the town's rules one by one, and grew from a watchman who followed the rules to a person who could rewrite the rules. Until he heard thousands of bones crying under the ground, and he recognized one of the voices, it was Master: "Don't trust anyone in this town, including me." And in the cracked seam of the bangzi, there was a blood deed with his birth date and horoscope written on it. —The town has new rules every night. But who set this rule to trap whom?