Operation: Save the Great Demon King

Yun Jie promised in a dream to save the world, then transmigrated to a cultivation continent and joined the sect under its oldest master. The old master told her stories, saying their mountain was called Luoyue Mountain because their founding ancestor wanted to defeat a heartless man with the word “moon” in his name. Much later, Yun Jie met that heartless man, who had suppressed himself for eight thousand years. Only then did she learn that Luoyue Mountain hadn't been named because its founder wanted to defeat him. It was because clouds only settle beside the moon. One-line summary: A story about a clueless young man who gets abducted into marriage, much to the outrage of the heavens.