Both are mini dramas in which a modern day cook travels back to ancient times and meets the ML.
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Both have a similar feel - the leads were close in school and then driven apart, meeting again years later. Both FLs are withdrawn and depressed, and are struggling with very difficult mothers, fathers who don't attempt to help/let the mother do what she wants, and a brother. The MLs were playful when young, but now cautious of being hurt again.

Both are mini dramas in which a modern day FL transmigrates into a fictional historical world where, using her medical skills, she helps solve cases or treat patients.

Both are mini dramas in which a modern day FL transmigrates into a fictional historical world where, using her medical skills, she helps solve cases or treat patients.

Both are mini dramas in which a modern day FL transmigrates into a fictional historical world where, using her medical skills, she helps solve cases or treat patients.

Both are historical fantasy dramas with a similar feel and vibe between the leads that begin with the FL rescuing the ML who is instantly taken with her but she treats him more like a child and calls him an odd endearment ("monster" vs. "little one"). Years later the FL returns with a different, harsher personality, and the two seem to be on opposite sides, but the ML is still in love. Both have an identical scene where the FL is invisible, spying on the ML, but he senses/sees her anyway. Both plots involve a magical and dangerous sword that the ML has.

Both are about a couple who face large challenges due to one of them becoming disabled or ill, but prevail thanks to their love for each other.

Both are about a couple who face large challenges due to one of them becoming disabled or ill, but prevail thanks to their love for each other.

Both are mini dramas in which one of the leads (ML vs. FL) impersonates their identical twin because the twin is dead or injured in an accident. Both main couples knew each other in school but were unsure whether the other lead liked them or their twin.

Both are dramas in which the FL exchanges places with her identical twin sister after her sister is hurt in an accident, leading to her becoming involved with the rich ML.

Both are mini dramas in which the FL exchanges places with her twin sister, leading to her becoming involved with the ML.

Both are mini dramas in which the FL exchanges places with an identical person, leading to her becoming involved with the rich ML.