C206 An Accidental Discovery of Poisoning

What's wrong with this Ya Lu? It had been so long, but no results had been found yet.

He picked up his phone and called Ya Lu. It rang for a long time before it was picked up.

"Ya Lu, how is the investigation of those workers that I asked you to investigate going?"

Ya Lu had been investigating these past few days. Up until now, he had only found some clues. It was very difficult to find clues