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Both leads have meet in multiple lifetimes that always end tragically. Both FLs have a dangerous, powerful identity inside them that ultimately takes over. Both MLs are demons in their current life, but not in the past ones. Both have "good" sects who actually do horrible things.
Both are revenge/reclaiming dramas with a similar vibe and the same director. Both exist in the same universe, with the leads of MLM making a cameo in ROTQ.
Both FLs return after being presumed dead to take revenge and/or reclaim what was theirs, teaming up with the son of the family they're fighting against.
Both dramas have a "nighttime" deity ML (Night vs. Moon) and a FL who has some sort of curse (blood vs. seeing ghosts). Both dramas have a similar feel and characters.
Very different plots, similar characters/main relationship. Both dramas have two lonely, poor, and damaged leads - a FL struggling with issues with her family and an orphan ML who works hard jobs - who become each others' family.
Both dramas are about two wounded young people - a somewhat withdrawn FL with an abusive father or stepfather and a "bad boy" ML who bond at school and end up saving each other. Both FLs are good students. At some point the FL ends up moving in with the ML to protect herself.
Both are about a suicidal, hopeless FL and rougher ML who bond at school, with the ML changing the FL's life.
Both are mini dramas with the same actor and actress as the leads and there's a little nod to TKIAR in a scene of TD.
Both are BL dramas in which the leads were a M/F couple in the past, and the FL has now reincarnated into a male.
Both dramas are love stories between a couple in which the FL is reincarnated as a male in the present day, and one of the MLs is under a curse which means they have a short time left to live unless they can break it.
Both are mini dramas in which a hapless modern day ML is transported to historical times and ends up a success there with several love interests.
Both are mini dramas set in a novel/manga with villain/morally gray leads. Both FLs are self aware and trying to change the story to change their fate.
