My Destined Villain: Starting from Rejecting the Saint's Engagement

Villain+System+Dirty Prank+Swordsmanship" Li Jian traveled through the fantasy world and became an undercover disciple of the Demon Sect. At this time, the sect is holding an engagement ceremony between the saint and the saint of the sect. Li Jian is a little confused? Something doesn't seem right about this plot? As a villain, it is not that the female protagonist likes the villain. The male protagonist comes to take revenge, completes a series of pretense and slaps in the face, and then makes a very shocking sentence: "Thirty years in the east of Hedong, thirty years in Hexi." " Is this the right thing to say? What's going on now? If you just get engaged, what's going on with him as a villain? No, he can also make a fantasy version of Song Qingshu?