The Only Girl You Haven't Seen (2022)

It has almost the same story plot wherein the FL fell in love with the ML who's pretending to be mentally challenged. Also ML has 2 brothers.

FL here is smart same as in LWS.

Lovely Swords Girl is similar to TOGYHS because:
- FL forced to marry “stupid” ML
- FL plays with and protects ML at first
- when ML in Lovely Swords Girl turns normal, he also hides from his past identity from FL
- FL feels deceived and heartbroken by ML’s duplicity

Self-explanatory, this is season one of the series. If you are going to watch season 2, you might as well watch season one first. I don't even think season 2 has English subs yet.

FL finds herself forced to marry ML. ML is bullied by his family and FL defends him, causing him to fall in love with her. ML pretends to be weak, while hiding a secret identity.

ML has secret, secondary identity while pretending to be a different sort of personality (weak, playboy). In both, he unexpectently "acquires" the FL (as a wife vs. a maid) and falls in love with her.

Both feature arranged marriage turning into genuine devoted love in a historical setting. ML is strong and skilled at martial arts (although he's hiding it in TOGYNS), FL is intelligent and clever.

FL finds herself unexpectently married to the ML in an arranged marriage. She is not the person she appears/is pretending to be. The marriage ends up turning into true love.

Both feature arranged marriages turning into love and a scheming brother trying to destroy the ML.
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FL finds herself in an arranged marriage with the ML that turns into genuine love. The ML hides his true identity/personality behind a different persona (pretending to be a eunuch vs. pretending to be unintelligent).

Both are mini dramas in which the FL dies and returns in another girl's body for revenge. Both have a palace setting and two MLs who become involved with the FL either in love or revenge.

FL transmigrates to another girl's body and assumes her identity.
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While different in plot and tone, both feature a FL who ends up in another girl's body and lives under her identity with her family. The ML has a secret, darker identity than the persona he seems to be. Both are short length dramas.

FL "dies" and comes back in another girl's face/body. FL is a strong, intelligent, and clever character who takes revenge upon those who wronged her. The ML is a good fighter with the FL his weak spot. Both are historical setting and part of the plot revolves around a plague outbreak with the FL attempting to find a cure.

Both dramas have FLs occupying the body of a different girl.
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In the beginning of both dramas the FL is murdered, only to revive "different" (in TOGYHS she enters another girl's body, in MDD another girl's spirit enters her body). Shortly after she meets the ML who is hiding a secret of some kind. Both are relatively short, mostly fluffy historical dramas.