Both are mini dramas in which the FL is out for revenge against a husband or boyfriend who wronged her.
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Both are mini dramas in which the FL is betrayed by her fiancée and embarks on a mission of revenge, causing her to become entangled with a man who assists her.
Both are mini dramas in which the FL's boyfriend/fiancée cheats on her with her scheming sister, setting the FL down a path of revenge against her horrible family. In the process, she becomes involved with a man who helped her.
Both are mini dramas in which the FL is betrayed by her cheating/scheming boyfriend and embarks on a mission of revenge, in the process becoming romantically involved with a man who helped her.
Both are mini dramas about the FL getting back at her cheating fiancée and finding a new love along the way, as well as discovering a surprising past connection to her new love.
Both are mini dramas in which the FL is out for revenge against a husband or boyfriend who wronged her and her sister who cheated with her boyfriend/husband.