Both are about ghost marriages and involve horror elements in a historical setting.
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Both are light historical dramas in which the FL disguises herself as a boy to enter a male-only school and ends up roommates with the ML who she clashes with at first.

Both FLs disguise themselves as male in order to enter a boys only academy where they end up roommates with the ML who they initially dislike but later fall in love with.

Both are set in high school and follow a withdrawn FL and a ML who has/had a life threatening illness who fears his life will be short. Both couples help each other overcome their fears.

Both are mini dramas in which the FL has a magical piece of jewelry which gives her confidence and changes her in some way.

Both are mini dramas in which the FL has a magical piece of jewelry which gives her confidence and changes her in some way.

Both are historical mini dramas in which the leads met years before when the ML in armor was wounded and rescued by the FL. Both FLs have distinctive scars and later have their faces changed. However the ML in AFS is much nicer.

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Both FLs disguise as men and join the army, becoming a general. Both MLs discover the FL's gender when they accidentally see her taking a bath.

Both are mini dramas with a similar feel, centered around a fictional and unique city, a strong FL determined to accomplish her goals, and a ML with a hidden identity/agenda.

Both have a lead who magically transforms into an animal at a certain time due to a curse and turns back into a human when kissed by a specific person. Both have a limited time in which to break their curse otherwise they will transform permanently into an animal. Both have leads who work together, with the FL initially disliking the ML.

Both are historical mini dramas in which through some fate of birth (sixth daughter vs. twins) the FL's existence is considered a threat to the kingdom for which she was supposed to be killed at birth, but her parents protected her by either disguising her as a boy or hiding her. The FL somehow ends up married. Both MLs are devoted to the FLs and learn her secret before anyone else.