Specifically I have forgotten almost, that is, one of the maps you go towards the Mo Ming Lin before entering will say: there is a danger ahead, should not enter and such nonsense, then you go back a map, there is an old man, and his conversation, and then go back to the village, you can see the village chief to pick up the Mo Ming Grass quest. Then you can kick the grass near the exit of the two exits of the Mo Ming forest to get Mo Ming grass.