Pen Sin: Tiangong's Prison Release

I am the best spy in the Ministry of Punishment and the dirtiest sword in the imperial court. They asked me to deal with "trouble" and I used my medical skills and mechanisms to make everything look like a perfect accident. Until "Ink Kill" appeared. The sinner dies peacefully, with his guilt floating on his body like an ink tattoo. The civil and military officials of the Manchu Dynasty asked me to investigate, because I am the only one in the entire capital who can use similar techniques to kill people. I became the murderer I hunted. In order to prove my innocence, I forged clues, misled my colleagues, and danced alone on the tip of a knife. Until the woman named Qing Mo appeared. She looked at me like she was looking at a poor liar. "The scene you faked," she chuckled, "has more flaws than the people I killed." We have a tacit understanding and use each other. She borrowed my knife to clean up the house; I borrowed her hand to eradicate the demons in my heart. But when the fire that burned the sky fifteen years ago was rekindled, I was shocked to realize that we were all just pawns. The person playing chess is the dead soul who I personally identified and put into the coffin. He stroked my head gently, just like before: "My child, you are my most perfect work. Now, come and put the final touches on my kingdom of God on earth." The tip of my pen hangs over the paper, and the ink will not drip. This time, whose name should be written down and whose death sentence should be sentenced?