Even though the two ingredients seemed identical, there was a huge difference between them.
The main ingredient to produce a sobering potion was the Bohe grass, which was commonly seen everywhere. The students had paid attention when they watched Luo De as he made the potion, but they were mainly focused on his actions. No one paid any notice to the Bohe grass, a common medicinal ingredient.
As far as they knew, there was another medicinal ingredient that looked similar to the Bohe grass, and that was the Hanjiu grass.
Even though the plants looked similar, they had the opposite usage or functions. Furthermore, the Hanjiu grass was not as common as the Bohe grass. Most of them would have only seen a drawing of it in the books.
