After Transmigrating into a Book, I Wooed the Darkened Immortal Venerable with Cheesy Pickup Lines

On my first day as the villainess in a cultivation world, the System told me to keep myself alive by flirting with the male lead after he turned evil. I gritted my teeth and tried, and his ears turned bright red. He could barely hold on to his sword. What happened to the cold-blooded killer? Now he waits for me every day with a stern face, hoping I’ll flirt with him, but his corruption level hasn’t budged. The System is driving me crazy!