emeraldarrows

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.

Both MLs are wealthy CEOs who have a traumatic past and issues as a result who end up cohabitating with the poorer FL. They later find out they met in childhood.

Both have a FL in a entertainment/fashion industry (makeup and livestreaming vs. singer and later clothing designer). MLs are cold at first then very doting when they fall on love. The secondary couples are very similar in both shows with a softer male who chases her vs. colder more distant female who pushes him away at first.