There are always people in novels who are handsome and extraordinary, or dangerous and alluring, yet because they are villains, they can only make way for the male leads’ love stories.
So the System chose someone to save these villains and give them happiness.
World One: Substitute romance. He is the substitute lover who looks like the protagonist the villain is obsessed with.
World Two: Twin romance.
World Three: The top candidate of the imperial examination x the Ninth-Thousand-Year Lord