章 444: Another Fiancée

"Since it's poisoning, there has to be a source, right? What kind of source can infect these people at the same time?"

Tang Zhe had long investigated this. He had investigated many people, but other than the fact that they had all gone to the black market, he did not find any other useful information.

The black market was vast and there were many people. There were countless shady stalls, like an endless pedestrian street.

Most of the people who came to the black market were for business. He could start checking from the shops, but it would take a lot of time if this continued.

Now that they were short of manpower, the higher-ups would probably have already invited Yi Zheng to tea before they could find out.

Shi Man frowned when she was deep in thought. Her fingers knocked on the table either intentionally or unintentionally.

Yi Zheng looked at her thoughtfully and asked in a low voice, "What did you think of?"