As I've been told, some of them are potions that can improve one's ability, others are potions that can restore one's youth. Each of them has different effects, but they all have one thing in common: there are some toxins in these potions, and they do great harm to one's body. It reminds me of Zhang Daqiao, the owner of this factory, who probably took these medicines to recover his youth. I don't know what the harm of this medicines is. And not every factory from No. 1 to No. 5 has such a basement. There are many factories just to hide the basement. If I'm not mistaken, if there...