Ru Hua Ru Tu (2022)

Both have a FL from the real modern world who enters a story, and ends up becoming involved with the plot's antagonist.

In a story, the ML is supposed to be a destructive villain who falls in love with a noble lady (the FL of the original story). But the true FL (a modern day woman) accidentally gets sucked into the story where she takes over the body of a woman (not the original FL) and starts to interfere with the plot to ensure the right outcome. The "villain" ML softens and seems to fall for the true FL after she seems to fall for him first (despite her obvious interest in the SML, which makes the ML quite jealous).

Both are short length dramas in which a FL from the modern world enters a historical fictional story. As she attempts to keep the plot on track and survive to return home, she ends up becoming involved with the story's villain.

Both are mini dramas in which a modern day FL enters the world of a historical novel.
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Both are short length dramas with a demon ML and a quirky, endearing FL.
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Both are mini dramas with a historical setting and the same actors as the main couple.
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Both are short length series in which a real world FL enters a fictional historical world (story vs. drama). Her efforts to return home change the plot as well as cause her to become involved with the plot's antagonist who is the ML.

Both FLs are from the modern day/future, and travel to a historical fictional world where they meet and become involved with the villain/antagonist ML.

Both are short length dramas in which a FL from the modern world enters a historical fictional story. As she attempts to keep the plot on track and survive to return home, she ends up meeting and falling in love with the story's villain.

Both are mini dramas about a modern day FL who enters the world of a historical novel in which the ML is or will eventually become a villain. She begins changing the story and falls in love with the ML.

Both are mini dramas in which a modern day FL enters the world of a historical novel. She has a "host/guide" only she can see/hear.

Both are short length dramas in which a FL from the modern world enters a historical fictional story. As she attempts to keep the plot on track and survive to return home, she ends up meeting and falling in love with the story's villain.

Both are mini dramas with a modern day FL who becomes a character in a historical novel. Both couples are initially antagonistic.

Both are short length dramas with a real world FL entering the fictional world of a novel and falling in love with the villain.

Short dramas. ML is a powerful fighter with a serious demeanour. FL is flirtatious - definitely not shy. Both leads have an agenda and secrets. Both dramas focus heavily on romance and romance-driven sacrifice with very little plot or filler.