Just Fiancée (2022)

Both dramas involve a contract marriage between a couple in order for the ML to make his ill grandparent happy,

Both have twin sisters dating the same guy. After the first one dates him (sa a shame in front of the press only) and the second one dates him for real. The first one suffers in an accident and disappears and then is replaced by second sister. Both sisters have different personalities..

Both are dramas with a contract marriage between the main couple.
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It's also a mini-series that is fast-paced and doesn't focus much on the plot . It has a few characters and the story mostly revolves around them

Both are mini dramas. Both FLs are impersonating their identical twin sister, leading to them living with the ML. The two then fall in love.

Both are mini dramas with a contract relationship between the leads.
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Both are mini dramas with a contract marriage between the leads.
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Both dramas have a contract relationship between a rich CEO and a poor and quirky FL.
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Both are mini dramas in which identical FLs of different personalities swap places in a contract marriage to a rich CEO after the original fiancée runs off/disappears shortly before the wedding. The ML ends up falling for the replacement bride.

Both dramas involve a rich ML who needs to marry a woman to appease his ill grandparent who raised him and is his only relative. He enters into a contract marriage with the FL who has swapped places with his original contract marriage fiancée, her identical twin. The ML and the replacement bride end up falling in love.

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

Both are mini dramas in which the rich ML is in a contract relationship with the FL to pretend to be someone else (his long lost sister vs. lost fiancée) in order to make his sick grandfather happy.

tell the story about a man looking for his lover and the mystery around her dissaperance. although both stories take and unexpected turn.

Both dramas involve the FL pretending to be someone she looks exactly alike which leads to the ML making her pose as that person. She then enters a wealthy family whose grandfather is ill.

Both are shorter dramas with a contract relationship between the main couple that becomes true love.