Twin Sisters (2021)

Both are mini dramas. Both FLs are impersonating their identical twin sister, leading to a romance with the ML. Both dramas have secondary couples.

Both are short length dramas about a pair of identical twins who swap places, with the one falling for her sister's fiancée/husband.

Both are short length dramas about a pair of identical twins who have been separated since early childhood and end up swapping places.

Both dramas are about a set of identical twins with very different personalities who swap places with each other, leading to the one falling in love with the ML who in a contract/agreement with parents was supposed to marry her sister.

Both dramas are about identical twin sisters with different personalities who due to circumstances end up swapping identities.

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 in which identical twin sisters trade places, leading to one falling in love with and/or marrying her sister's fiancée.