Dressed as a Villain, I Want to Be the Protagonist!

Gu Longyuan died unfortunately because of saving others, but he was lucky enough to survive. Unfortunately, he dressed as a villain, but he successfully awakened the system. But the system he awakened asked him to attack the protagonist Long Aotian, and Gu Longyuan did so, and he also wanted to be the protagonist. (Realm: body refining, hammer bone, concentration, unity, master, trance, trance, immortality.)