He's Already a Demon, so What's the Point of Talking About Martial Ethics?

A knife splits the path of life and death, and my fate is up to me. Traveling through another world, he became an undercover agent who sneaked into the Demon Sect's mountain gate. The road ahead is like walking on thin ice. Fortunately, the attribute panel is awakened in time, and the skills learned can be improved at the cost of the evil spirit. Step by step from the outer sect of the Demon Sect, he became the closed disciple of the first generation Demon Lord. It has also been inherited from ancient times. Su Ming: "I'm going to become a villain, why don't the decent guys send someone to attack?" In this world, the human realm and the demon realm are separated. Neither of them is allowed to enter the other party's territory privately. One day, Su Ming picked up a white snake. This started a new chapter in his life. Everything has to start with the knife in his hand...