Both leads are from the real world and enter into a historical VR game together where they fall in love.

Both are mini dramas in which the FL transmigrates into a fictional world (game vs. book) and falls for the ML who is a white nine tailed fox.

Both are Republican Era mini dramas in which the leads have a past connection and now meet again with the FL having married the ML's father to take revenge for her family.

Both are Republican Era mini dramas in which the FL marries the ML's father to take revenge for her family.

Both FLs are fox shifters who are discovered in fox form by the ML who keeps them as a pet and later secretly learns their identity. Both dramas are fantasy/historicals.

Both are historical/fantasy mini dramas with the same actress as the FL. In both, she is a fox who falls in love with the human ML.

Both have the similar concept of two women marrying two very different grooms at the same time, ending up with the opposite man from the one they expected/were engaged to. Despite the mix up, it turns out both couples are best suited for each other. One of the grooms in both dramas is a general and the other is a sick/disabled young man.

Both are historical mini dramas and have the similar concept of a marriage mix-up of some sort with the FLs being the favored and less favorite daughters of the same family. In both, despite the switch or mix-up, the marriage(s) end up being (a) perfect match(s).

Both have the similar concept of two women marrying two very different grooms at the same time, ending up with the opposite man from the one they expected/were engaged to. Despite the mix up, it turns out both couples are best suited for each other.

Both have the similar concept of sisters, one more favored than the other, marrying two very different grooms at the same time, ending up with the opposite man from the one they expected/were engaged to. Despite the mix up, it turns out both couples are best suited for each other.

Both are historical dramas centered around talented musicians. Both have a similar tone.
..............................................

Both are historical dramas in which the FL disguises as male and attends a boys-only college, becoming roommates with the ML who becomes her love interest.