Both are upbeat mystery/romance dramas with a sweet couple.
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Mystery/historical/romance genre with the main couple working on investigations together.
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Mystery/historical/romance genre with the main couple working on investigations together.
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Historical/mystery dramas focusing on a trio of characters. Both MLs are intelligent, top of their class, and end up leaving the palace, traveling to rural town(s). The relationship between the ML and his servant is very similar (more close friendship than master and servant).

Both are supernatural/fantasy dramas of short(er) length in which a main character must perform a specific number of tasks in order to achieve something they desire.

Both are heavy in tone dramas dealing with life and death with the message of cherishing the time you have. There are many side stories as well as the main characters' story. Also at least one of the MLs in both dramas is immortal and has a past connection in someway to the FL.

ML is an emperor or the son of the emperor, and the FL is a plucky servant in the palace who wins his heart with her cooking. Both are sweet dramas.

Both are love stories between a prince and a female servant who enters the palace.
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FL vs. ML is a shapeshifting human/cat living with a human who they fall in love with.
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FL vs. ML is from another world and is a shapeshifting human/cat.
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Both are cute dramas with a cat/human shapeshifting ML from another planet and a human FL who he loves.

ML is a cat/human who appears as a human with cat ears, and ends up sharing a home with a lonely, isolated human who once saved him.