Both are age gap romances with an older FL and a younger ML who falls first and determinedly pursues the FL who at first sees him as only a kid.

Both are older FL/younger ML romances in which the ML falls first and chases the FL for a while before she reciprocates.

Both are older FL/younger ML romances in which the ML falls first and chases the FL for a while before she reciprocates.

It's a bonus episode to the drama and finishes the story.
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So far it seems to have a similar vibe but a very different length. Both FLs are strong characters, demon sect leaders, and begin the drama by rescuing the ML and making him their student. Both FLs died in the past and are now reborn.

Both dramas have a school setting with a smart, colder ML and a FL who follows him to college.
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Both of the couples are deskmates in school, the MLs are intelligent and a bit cold but quietly loves the FL. The FLs are a poorer student and helped out by the ML.

Both dramas have a school setting and similar vibes.
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Both are short length dramas with the same actor as the ML. In both the couples are separated for years due to misunderstanding/lies, and then unexpectedly cross paths again, with one of the leads discovering a shocking twist (in LS the FL discovers the ML who she thought was dead is alive and living under a different name, whereas in LE the ML discovers the FL was pregnant and still in love with him when she rejected him those years ago and is currently raising their young daughter).

Both MLs are the second sons of a very rich family and the FLs are poor and end up being forced to live in the same house as the ML. Both couples face a personal obstacle to their relationship beyond their difference in social status (age gap vs. family disapproval).

Both dramas have a visually impaired ML and a FL who opens up his world.
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Both are short dramas in which the ML is visually impaired and wealthy, and the FL begins the series by sneaking into his home/workplace only to be caught by him.