The old city is about to be demolished, and a century-old case is being solved in the Qidao Yinlu of the Gu family compound. The person who died, Chen Sang, held the thin manual left by the master, relied on a copper ruler and a yin and yang left eye to complete the last journey for the deceased. The first seven times he went back to the door, he measured his breath with a copper ruler and called his name at the bottom of the well - he thought it was just an ordinary matter until the man in gray called his name and introduced him to the Gu family. Seven Yin Laws, seven levels of killing, each time one is broken, one will lose three months of life. Master did not come out of the Gu family three months ago, and the last page of the manual was torn off. My sister disappeared in front of this arcade twelve years ago, and no one remembers her existence. Chen Sang had only one idea: to find his sister and ask for an answer.
