The Days I Fought the Scumbag Male Lead for His Women

“I know you've liked me for a long time. I like you too. Let's be together.” “What? Sorry, I'm pursuing your girlfriend/wife/romantic interest.” [That's basically the story. This lousy author can't write blurbs, so just get the gist.] World One: Scumbag's white moonlight X scumbag's wife World Two: One of a scumbag's harem X spoiled young lady World Three: Older woman X kind, innocent girl Theme: The greater good comes first