A man in a black shirt handed over a document to Si Yiyan. "Ninth Young Master, I have investigated all of Yang Chongguang's connections and friends, and did not discover anyone is suspicious."
Si Yiyan remained silent and deep in thought.
The man in black had a sudden shock and sweat covered his forehead. "We have checked all surveillance cameras surrounding the Qingfeng Building on the night of Yang Chongguang's death. There were no suspicious characters entering or leaving the building."
Si Yiyan lightly tapped on the tea table with his finger—a common sound with an aggressive rhythm. The ambiance was tense. "How was the investigation on Ning Shuqian?"
