Responses
I don't know if you have ever read it, but I can recommend a manga exactly like what you want. It's called "May I Ask For One Final Thing?" She beats up her cheating fiance in the first chapter, and she continues to beat up everything in her way.
Dear gods I want to see a story where the female lead straight up beats the 'rival' half to death. Or better yet have dragons chew her to pieces. Frankly I suspect she killed her fiancee in an attempt to get a better chance at a dragon through his brother or something. Please tell me she dies a bloody death.
Also the art seems so strange. Like their shiny shiny lips!