Both are historical mini dramas in which the FL was injured and has lost her memory. One of the leads believe the other killed their people and stole some object and are out for revenge. Both FLs are assisted by the SML. Both dramas have a different place/dimension that the leads enter.

Both are Republican Era mini dramas in which the FL is out for revenge against the ML who she wrongfully believes killed someone close to her. Both involve the FL stabbing the ML, losing/pretending to lose her mind, misunderstandings, and a hate/love relationship between the leads.

Both are mini dramas set in a world where merfolk are mistreated and/or hunted and involve a relationship between one of them and a human detective.

Both have a mermaid/merman as one of the leads and a human as the other. Both involve a merman captured by a powerful person/sect.

Both FLs disguise themselves as a man and investigate cases. Both MLs seem cold initially but melt around the FL, learn her secret, and protect her while solving the cases alongside her.

Both dramas are based upon the same story and follow the same plot, but one is a mini drama and the other full length.

Both MLs are fated to die young due to a curse or prophesy. Both FLs are their disciples who they are forbidden to fall in love with but do so anyway.

Both have a master/disciple relationship between the leads, with the FL prophesied to be the doom of the ML. Despite initially wanting her gone, he falls in love with her.

Both FLs are the survivor of their people being wiped out, and the MLs were orphaned when young and gifted. Both leads attend a wuxia school together. Both dramas have a similar feel and both have Xu Kai as the ML.

Both are mini dramas in which the FL is a princess who enters into a peace keeping marriage with 4 or 5 princes.

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Both are mini dramas with a modern day FL who time travels back to a village in the 1980s and falls in love with the man she's married to in that time period.