Who is the stranger who texted the Huang Yang brothers?

I don't know whether it is inconvenient for the police or the media to disclose it or not to think about it at all, let alone who sent the text message, and even the original text of the text message has not been published. The existing information is that the SMS reminded Brother Sun to pay attention to a drug, and then he reported it to his mentor. After consulting a lot of information, he learned about the poison, and then he suspected Lin, but the most critical SMS itself was not reported, and even Brother Sun made it up!