If You Don't Want to Eat the Holy Maiden's Soft Rice, Will You Go Undercover in the Demon Sect?

[System + Anti-routine + Decisive killing + Invincible at the same level] Reborn in a fantasy world, Ye Yuan has the most standard protagonist template. His parents are dead, he is a useless person in spiritual practice, and he has a saintly fiancée... Not only did the saint Jiang Xixue not break off the engagement, but she also allowed him to live on a soft diet for three years, and provided him with numerous elixirs and spiritual weapons. She even wanted to practice dual cultivation with Ye Yuan and use the power of Yuan Yin to help him open up his meridians... The fiancée of a rich woman smells so good... Ye Yuan, who originally planned to be destroyed, was unexpectedly framed during his practice, and the evil spirit entered his body, and the system was awakened as a result. [Evil Qi System]: Kill people and monsters to get evil energy points. Evil spirit can directly improve cultivation level. "Huh?!" Looking at such an outrageous system. Ye Yuan's eyes shone. With this system in hand, wouldn't it mean that the Demon Sect is invincible? Ye Yuan left a piece of paper to cancel the engagement and decisively turned around to join the Demon Sect as an undercover agent. After all, only in the Demon Sect can the maximum value of the system be brought into play, and he can break through at the fastest speed. From then on, in the Blood Evil Sect, one of the four major demon sects, a demon appeared that all the disciples could not avoid. "What? You dare to look at me one more time? I'll kill you!" "What? You said righteous people are idiots? Do you know that I was once a righteous person? I will kill you!" Ye Yuan's decisive character in killing made even the Demon Sect monks tremble with fear, and he gained a group of disciples as a result. "Brother Ye, some people say that you are the devil among devils, and you kill the whole family at every turn." Ye Yuan frowned: "Fart, this is simply alarmist! Who is spreading rumors about me! Let's see if I don't kill his whole family!"