Both dramas have a more fluffy, sweet tone and portray the relationship between the ML who is an artificial intelligence, and the human FL who they live with.

Both MLs are artificial intelligence created for a specific purpose, and the FLs are human.
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Both have MLs who are artificial intelligence and fall in love with a human FL.
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Both are fantasy dramas with a similar feel and tone, with a long past connection between the leads. Both MLs are very devoted to the FL.

ML vs. FL is a supernatural being who is collecting something (scents vs. emotions) from humans. They end up falling in love with the human who has the last thing they need and must make a difficult decision.

Both dramas have a similar dynamic between the main couples - the FLs are in a position of higher power but her life is constantly at risk and there is no one she can trust, and the MLs are her devoted bodyguards with a secret royal identity.

Both are short dramas in a historical setting. The FLs are spirited and in a position of power, and the MLs are her loyal, often suffering bodyguards/servants.

Both dramas are about an office setting romance between co-workers who have a large age gap, with the younger ML falling first and the older FL initially reluctant to return his affections due to society's judgement.

Both are romances with an older working FL who is or was the younger ML's teacher. Both MLs fall first and it takes the FL a while to reciprocate.

Both are short length dramas with a romance between an older FL and a younger ML.
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Both are short length dramas with the older FL and younger ML knowing each other years before and now ending up working together in the same business. At first, the FL ignores the ML's interest in her, and treats him like a kid.

Both are short length dramas about a love story between an older office working FL and a younger ML.