Both are different adaptations of the same story, one told in movie form, the other as a short length drama. The drama's FL is more mature and warmer, though.
Both dramas involve the FL pretending to be someone she looks exactly alike (twin sister vs. a stranger), leading to a relationship between her and the ML.
Both are mini dramas about a contract marriage between an innocent, younger FL and a wealthy ML.
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Both are mini dramas with a ML who is visually impaired (in some way) following an accident that was later discovered to be intentional, and a FL who enters his life under false pretenses. Both leads are in a form of design (perfume vs. jewelry).
Both dramas involve identical twin sisters who swap places, leading to one marrying and/or falling in love with the man her sister was supposed to be with.
Both dramas involve identical twin sisters who swap places, leading to one marrying and/or falling in love with the man her sister was supposed to be with. Both sisters have vastly different personalities, one good and one evil.
Both are mini dramas in which an abusive parent forces the FL to take the place of a sister or family member and marry the wealthy disabled heir of a family the other girl was supposed to marry. The FL is protective of him against his scheming family members and the two fall in love.
Both are mini dramas in which identical twin sisters with very different personalities are forced to trade places by their parent/parents, leading to one marrying and falling love with her sister's rich fiancée.