Is there a Chinese novel about cultivators in which the MC is not the MC, but the MC's opponent? For example, what would await the young master, if the MC had not possessed him. An excerpt from the novel History’s Strongest Senior Brother. The attendant and entourage would act first to incite conflict. Once the lower thugs were defeated, the malicious young master (MC of the author) would act personally because he felt his pride had been stung. The young master (MC of the author) would be beaten until not even his mother would recognize his face, which would incite his father’s involvement and his entire family’s involvement. In the end, the entire group would be annihilated. P.S. Here is chapter 2 of History's Strongest Senior Brother, so you know what I mean - https://clck.ru/XXZP5
What you want is a ML that opose MC for a long time. Even HSSB mc is mc, others have the archetypal of MC plot armor from other cultivation novels to make a joke about xianxia/xuanhuan novels (and there’s where comedy stop in HSSB and that’s why i love that novel).
I want a story about a mortal human who uses intelligence and wisdom to fight against a Chinese xianxia MC with plot armor. A real one, not another parody. He should be unkillable and undefeatable. True xianxia MCs can't be defeated by doing some planning and training, they come back stronger after death and slaughter your nine generations. And you definitely can't outluck all their cheats in succession, mortal humans don't have such luck.
Experimental Log of the Crazy Lich is like this, except it's a plot point that only appears in the open later on but basically the protagonist is anti-gods in a world ruled by the gods, and the strongest god is plot armour incarnate with even a system. despite it being a comedy book the plot is very very good, but if you dislike the comedy don't even bother forcing yourself to read it