Romance of a Twin Flower (2023)

Both FLs take the place of their identical twin sister, leading to them living with the ML. The two then fall in love.

Both are historical dramas in which the FL is an unfavored identical twin who ends up swapping identities with her dead sister and marrying the ML.

Both are about identical twin sisters who were separated in infancy and raised by different families. As adults, with very different personalities and lives, the FLs take the place of their identical twin sister, leading to them falling in love with the MLs.