Grasping Evil - Eastern Fantasy

Master said, the woman I held in my hands, I must protect for the rest of my life
Master said, it’s hard to cultivate as a Demon, and once you enter the Demon Dao, you should never look back.
Master said, Heaven is a Circle and the Earth is a Square; that Circle represents (is) consummate perfection, and that Square represents (is) the edges and corners of one’s Heart, it’s a rebellion against Fate, a Disobedience to Heaven.
My master is named Ning Fan, he’s not a person, he’s merely a Butterfly who has entered Demonhood. He was searching for someone. No one knew who he was searching for. No one knew how long he would search for…