Fantasy Villain: I Break Off the Engagement from the Start

He transmigrates into a fantasy novel as the standard-issue villain, and he's also the heroine's fiancé. The male lead kills him with a single slap. Xiao Che: “If I can't beat him, I can at least run away, right?” At the wedding banquet, he tears up the marriage contract and swears in blood: “Whoever goes back on this will be struck by lightning!” The heroine is stunned, the male lead is dumbfounded, and the whole sect stares in disbelief. From then on, the Sword Sect's top prodigy avoids romance and the protagonist, focusing entirely on staying alive. He secretly practices demonic arts, curries favor with demonic spies, and quietly makes a fortune. System: Probability of the Host being killed by the male lead: 95% → 90% Xiao Che: “...You useless System, you're really leaving me no way out!”