Both are historical mini dramas in which the FL believes the ML killed her father and she hates him. Both leads marry early on in the drama, followed by a lot of angst and misunderstandings.

Both are historical mini dramas with a ton of angst, FL misunderstanding and suspecting the ML, and a tragic ending.

Both are historical mini dramas with a ton of angst, FL misunderstanding and suspecting the ML, and a tragic ending.

Both FLs are self-aware characters doomed to die in a historical novel. Despite this, they decide to fight their fate. Both MLs are morally gray and an enemy to the FL at first.

Both FLs are villains in fictional stories who get a chance to fight against their fate and find unexpected love in the process. Both are short length dramas.

Both are music themed Korean BLs.
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The Red Sleeve tells the story of the son of Sado who is the main focus of Crimson Moon.
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Both have an environmental message and focus on the relationship between a mermaid and a human.
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Both have the same actress as one of the FLs and are about the relationship between a human and a mermaid. Both have censored/implied GL vibes.

Both FLs have their faces exchanged with another girl and are believed to be dead, and both are on a quest (to solve a mystery vs. revenge). Both MLs are mysterious figures who the FL initially doubts.

Both are historical/fantasy dramas that involve a seeming magical ability to exchange faces between different people.

Both FLs are face swapped and believed to be dead. Both MLs recognize certain mannerisms/behaviors in the FL, leading them to question her identity.