How Come I, the Mighty Devil, Have Become a Tool?

Gu Beiyue was confused sometimes. He was obviously ruthless, despicable, cruel, and a notorious devil, but why were there so many people desperately trying to be loyal to him? … Demon Sect Elder: Can you make great progress by protecting the Demon Lord from being assassinated? What the hell is this line of writing in front of me? Protector of the Demon Sect: If you bring back the beauty in front of you and present it to the Demon Lord, can you get a powerful secret? Hiss! Appeared again, am I the son of destiny? Righteous Saint: What? As long as I am willing to surrender to this devil, can the thousand-year curse of my blood be lifted? … Above the sky tower, Gu Beiyue looked at the beauties around him and the extremely respectful powerful men in front of him, feeling infinitely sad in his heart. Among these beauties there were many chaste and fierce women and mortal enemies of the devil. Originally, he wanted to kill them after using them, but who would have thought that they would change their temper when they saw him? There are also those strongest people who don't seem to know what shame is, and they insist on being loyal to them. What's even more amazing is that the speed at which they become stronger is almost as if they are cheating! He really can't figure it out... [This book is also known as: "The Demon Lord Becomes the Grandfather of the System", "Subordinate: I can see the mission rewards on the Demon Lord!" ", "I carry the banner for the Demon Lord!