emeraldarrows

Both are historical dramas in which the ML is a king and the FL is his servant or working for him in the palace. Both have people plotting to get rid of the king, and are a mix of fluffy anachronistic humor and heavier moments.

Both are love stories between a ruler and his servant.
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Both are love stories between a ruler and his servant. One is fantasy, the other only historical but both have a similar feel.

Both are love stories between a ruler and his servant. Both FLs are considered unlikely love interests (disguised as a male vs. a "plain" maid).

Both are historical Korean dramas with similar pacing and tone, with the first couple/few episodes focusing on the ML's parents before the ML grows up and becomes the focus of the story. Both MLs have superhuman strength and are feared/wanted to be killed by others. The FLs are the ML's second love, not first. Both featuring supporting characters who are courtesans and are heavily involving in the politics of the country. The villain remains largely in power/on top for the entire drama, only meeting his end in the final episode.

Both MLs are demons and were/are in a forbidden relationship with the FL. Both involve tragic pasts and reincarnation. Both FLs are cold/heartless.

Both MLs are mythical beings who has spent centuries waiting for their true love who died tragically for them to reincarnate and return. When he finally finds her, she has no memories and a different personality.

Both are dramas that involve a pair of lovers whose story ended tragically in history. Now they are reincarnated and reunited in present day, but one has a completely different personality.

Both are mini dramas that involve a pair of lovers whose story ended tragically in history. Now they are reincarnated and reunited in present day, but one has a completely different personality.

Both are mini dramas in which the leads love story ended tragically in the past and one of the leads has been waiting centuries for his love to reincarnate and get their happily ever after. However when he finds them, they are very different (different gender vs. completely different personality).

The same story/character, just different actors, one is a longer drama and one is a short mini drama.

Both are mini dramas about a famous FL who lies about the ML being her boyfriend, and the ML who has/develops a crush on her goes along with her lie.