Both FLs are modern day doctors who time travel to the past and have a mark on their face that they soon remove. Both MLs are cruel to the FLs at first.

Both are short length dramas in which the FL is a modern day doctor transmigrated into the body of a mistreated wife of a prince.

Both are historical mini dramas with a love/hate relationship between the leads. At some point, FL wrongfully believes ML killed her parents. Later on, one of the leads is blinded and the other cares for them, pretending to be mute and writing in their hand, but the leads soon figures it out due to a gesture or skill they did.

Both are mini dramas with the same sort of plot - modern day FL time travels to the 1980s where she's married with a child/children and proves herself to the people in town who doubt her.

Both are historical mini dramas in which the ML keeps the FL prisoner and is obsessed with her and torments her.

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Both are murder mysteries in which the ML is suspected of being a killer and viewed as dangerous by those around him. In both, he's lost part of his memories and is uncertain of past events. Both dramas have a similar feel with dark vibes and all the characters having secrets.

Both are mini dramas with a contract relationship in which the FL hires the ML to pretend to be her boyfriend, and the two later fall in love.

Both MLs are reclusive and grumpy and their work involves books (as a writer or a bookstore owner), FLs are upbeat and a magical being. The couples either cohabitate or are next door neighbors. In both, there is an evil character attempting to use the FL and her abilities for their own goals, and the ML is injured protecting her while the two are being held on a boat. Both dramas have a similar vibe.

Both FLs are vampires and the MLs are humans who taste especially delicious to the FL.
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season 2 continues the story.
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Both are mini dramas in which a married couple break up after misunderstandings and lies. Both FLs return with a new appearance and identity for revenge. Both couples have a son who is secretly raised by one parent and the other doesn't know he exists. Both children are kidnapped by the SFL who is obsessed with the ML.