Geng Wushang's corpse showed the unique "pulling machine bow" shape unique to strychnos poisoning.Su Wuming's autopsy revealed that Geng Wushang actually committed suicide, and key evidence was found in the manuscript of his posthumous work - The Ning Corpse Chronicle - the handwriting on the expulsion document actually matched the handwriting on the murder note.

After Pei Xijun's comparison, the murderer was identified as Geng Wushang's second apprentice Yin Yao.