Wei Shu and Jiang Yang's eyes both flickered slightly.
He actually had a way to verify the authenticity of the vaccine? There were originally only five vials of the vaccine, where could he verify the true from the false?
Wei Jin seemed to know what the two were thinking, and his eyes deepened into a smile. "It's not the kind of verification method that uses smallpox patients to infect others, but one that can verify on the spot. As for what the method specifically is, I'd rather not say just yet. Wait until King Huan, you bring out the vaccine, then I will tell you!"
The corners of his mouth turned up. "This also prevents those with ill intentions who want to bluff their way through from having a strategy in advance!"
Having said this, he walked away in high spirits.
Jiang Yang and Wei Shu remained silent, but their expressions grew somewhat grave.
