Based on the information you provided, I would like to recommend a novel similar to the one written by Young Master Xu, Katsuharu-- It was an urban supernatural novel. The main character, Hua Kai, had transmigrated to a world similar to the middle period of the Warring States Period. He had the strongest family master system and thus established the strongest family. The book is filled with elements of the high-level martial arts style and the system style. It will definitely satisfy your taste. I hope you like this fairy's recommendation. Muah ~😗