emeraldarrows

Both are short length dramas in which the FL finds she has become the heroine of a fictional story (novel vs. manga) who is fated to die tragically. In order to try to survive she turns to the villain responsible for her death, which leads to changing the plot and unexpected romance.

In both the FL finds herself a character who is fated to die in a fictional world (novel vs. manga) and ends up getting close to the villain in order to try to change her fate and survive.

Both dramas take place within the world of a manga. The FL is self-aware, trying to change her story. In both she suffers from heart disease and falls for the ML who is an unexpected choice (minor supporting character vs. main antagonist) and who can help her in some way (change the story vs. ease her heart condition by kissing her).

In both, the ML is a character in a manga.
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Both are short length dramas in which FL is a self-aware manga character trying to change her story.

Both are short length dramas in which the ML is the antagonist of a manga.
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Both are a contract marriage story in which the two unexpectedly have a past connection. Both pairings have great chemistry. The same actor is the ML of DTMY and the SML of TTFIL.

Both have main characters who are cat/humans and end up living with a human.
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FL is a cutesy cat/human living with a serious human ML.
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ML vs. FL is a cat/human who ends up living with the human ML.
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Cat/human main character cohabitating with human.
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Both have a strong FL who disguises herself as male and a military ML who learns her secret early on but hides it for her.