C371 Old zhao killed his family?

"Sir, I heard that you were investigating the matter of the Old Zhao's family."

The other party asked in a probing and curious tone, a tone that I have encountered many times before. I didn't even raise my head, "Hmm, what's wrong with Old Zhao?"

The other party had emphasized the name Old Zhao, so I naturally wanted to know what he knew.

"Old Zhao poisoned his wife and three sons