After leaving the Wildman's lair, Yang Cheng thought that the ingredients for their sedative were probably Forget-Worry Grass.
And if he wasn't mistaken, the Hidden Cloud Village should previously have been in the area where Forget-Worry Grass grows, because the "Tome of the Ghost Doctor" mentioned that Forget-Worry Grass grows in the Hidden Cloud Village.
However, upon entering the village, he found that Forget-Worry Grass was scarce and not very tall.
Precisely because there was a lot of Forget-Worry Grass in that area, people often risked danger to go there and pick it, only to fall into the trap set by Scarface and others, who would rob and kill people passing by.
Yang Cheng needed Forget-Worry Grass now because it happened to cure the poison affecting Da Shan's parents.
