HELP

I've read this manhwa few months ago?? It's a story wherein she reincarnated as a villainess of the novel and therefore, she redeemed her wrongdoings and romanced the 2nd ml and was about to get married to him when the og fl came to light and was flirting with the 2nd ml?? And she got some powers to purify the monsters?? And in the end, she got married with the og ml and the 2nd ml was remorseful. For reference, the 2nd ml is blonde while the og ml is white haired with red eyes.