Ryu Sun Bi's Wedding Ceremony (2021)

Both are LGBTQ+ drama's set in South Korea.
Both of them also have an actor, Jang Eui Soo, in common.

Cross-dressing FL or ML, historical setting. ML loves the other regardless of gender.
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Both are about an LGBTQ+ couple living is South Korea.
Both have the actor Kang In Soo portraying a main character.

Both of these are webseries/mini series set in South Korea. They also both handle LGBTQ+ relationships.