Killing System, Kill the Maid at the Beginning

Traveling to a world of high martial arts, you will get a system that allows you to become stronger directly by killing enemies. At the beginning, he met the maid who wanted to murder him, so he killed her immediately! Step by step? Anyone who dares to stop me will be killed directly! In the last life, he died in frustration. In this life, Xu Yan lives his own glory. Whoever dares to mess with me will be buried with him! Does the world want to turn against me? Then destroy it! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.