I'm friends with the hero but I saved the villian

Fifty years ago, two families had a falling out due to different beliefs pitting against each other. The Takeo family used more harmful cultivation methods than some referred to as demonic and cruel. Although the Takeo family wasn't the only family who practiced these demonic arts, they were the ones to invent such cultivation and honed it to the highest degree.
The other family is the Mieko family. Not much is known about their cultivation, but it is known that the result of such cultivation is less crude, unlike the Takeo family practiced arts.
The only thing preventing those two families from fighting in a practitioner war is my family and the monsters that roam outside the walls. My family is the Asami family specializes in medicine and poisons. We are also a family specializing in arts similar to that ninjutsu or assassination. Due to my family's knowledge of toxins, we also worked to hone our abilities to cure others; this side of us is known through the city as the healers. With my family standing in the town as the most significant known doctors, we stand neutral when it comes to cultivation since our cultivation could be seen as crueler than the Takeo family. But that fact is unknown to the world.