Both dramas are about a modern day FL who enters a historically set game and must pass the levels to return to the real world.

Both dramas have a modern day FL entering a historical fictional world and becoming involved with the ML. In the original story one of the leads (ML vs. FL) is the villain.

Both dramas feature a modern day FL in historical times with VR elements.
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Both are short dramas in which a modern day FL enters a historically set game with a host and must pass the levels to return to the real world.

Both dramas are about a modern day FL who enters a historically set game with a host only she can hear and she must pass the levels to return to the real world.

Both dramas are about a modern day FL who enters a historically set game with a host only she can see or hear and she must pass the levels to return to the real world.

Both are short dramas in which a modern day FL enters a historically set game with a host and must pass the levels to return to the real world.

Both are short dramas in which a modern day FL enters a historically set game with a host and must pass the levels to return to the real world.

Both are Republican Era dramas in which the FL enters a household to get revenge upon the man she believes wronged/destroyed her family.

Both are short dramas in which the ML has a phobia of the dark and ends up clinging to the FL which makes them closer.

FL enters a different world and unexpectedly falls in love with the villain.
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Both dramas have a FL from the real world who finds herself having become a character in a story and falls in love with the story's villain.