Feng Jun asked Ninth Brother why he got injured like this because... he matched the treatment medicine.
Things like the Limb Regeneration Potion don't need to be mentioned, the Federation has such medicines. What he was looking for was an antidote to neutralize the corrosive toxin.
The corrosive toxin from the bugs here is quite daunting even for cultivators—even capable of corroding a Spiritual Qi Shield.
However, the toxin Chen Jiu was afflicted with is still treatable, it's just that two of the medicinal ingredients are quite rare in Kunhao, at least affordable only at the Innate stage. If someone at the Qi Refinement Realm wants them, it would depend on luck.
Feng Jun doesn't lack these medicinal ingredients, but since Chen Jiu isn't even at the Qi Refinement Realm, convincing him to help would be best with some other factors.
