Both focus on police and have a "case of the week" sort of format.
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Both are mystery dramas in which the MLs "die" in a boat explosion and return years later with a new identity. The FL instantly suspects their true identity and keeps testing them. Both MLs are looking for some object they left behind.

Both are historical mini dramas that begin with the FL being wronged in some way and meeting other people including a love interest to help her. Both FLs are skilled embroiderers or seamstresses.

Both are historical mini dramas centered around the FL's quest for revenge and her knowledge of embroidery.

Both are mini dramas with a mystery vibe in which the ML is "killed" in an accident and then meets the FL again, pretending to be someone else. Both MLs have an allergy that they pretend not to have with the new identity.

Both are short Chinese historical GL films in which one or both of the ladies are opera singers. Both have a tragic tone.

Both movies have a similar vibe and plot - the FLs are smart, strong, and have a career relating to monsters (treating them vs. hunting them). But MLs are hapless, weaker scholars who accidentally end up getting "pregnant" with a baby monster.

Both FLs are mermaids who come ashore and fall in love with the reincarnation of the ML who they were in love with in ancient times.

Both are historical dramas in which the FL loses her family and commits suicide, only to find herself a few years in the past. She then sets out to change what happened then.

Both are historical mini dramas in which a couple marry but then tragic events and hatred lead both of them to die and return a few years into the past. Both have their memories but don't know the other remembers as well.

Both are historical mini dramas in which the FL dies then travels back in time. While she hated the ML in her first life, in this one she falls in love.

Both are mini dramas with a modern day FL who time travels or enters a fictional historical world. Both MLs are non-human (half demon vs. vampire) and bond in some way with the FL.