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It's a villainess manhwa set at the ending of the story. The villainess avoided the death flags by befriending the heroine and marrying the 2nd male lead. It's the villainess' wedding day, and she has to get married at a specific castle on a specific day for some reason or she'll die. Her fiance runs off with the heroine, and the villainess has to find someone new to marry immediately. She marries someone else, and the fiance is salty about it for ages, which is the point. Something something revenge?
I don't think I read too far into it. If anyone knows which manhwa this is, it would be appreciated if you would let me know. Thanks.