It starts off very similar to "I Turn Out to Be a Grand Master" MC has a Kung-Fu system and thinks he's a Mortal. But he's OP as heck. He has Pets and a Skeleton servant named Scumbag.
try i turn out to be a grand master naw im playin but it sounds kinda like "I Am a Cultivation Bigshot" but instead of aa skeleton servant he just has a bunch of pets in his yard. MC in cultivation bigshot has a saint system that in the mtl is called aa Kung Fu system so you couldve read that but it basically taught him how to do everything in the world except cultivating and he had no spirit roots so he thought he was mortaal. In the end, because everything else taught by the system reaached the "Saint" realm it could directly interfere with heavenly laws in even a casual movement without using spirituaal energy. soooo yeaah.