C75 Heavy Punishment
The two men who came in were none other than Sun Jian and Wang Hu, who had been ordered by Ye Yuntao to exchange the Big Yellow Grass and Small Yellow Grass.
Sun Jian and Wang Hu were the drivers of Ye Xuan's transport of medicinal herbs. Later, they were bribed by Ye Yuntao with money and replaced the Big Yellow Grass with Small Yellow Grass on the way to transport the medicinal herbs