Both are historical mini dramas in which the FL is from the spirit tribe and enters the human palace or sect in order to retrieve someone or something.

ML and FL both can repeatedly time travel but only back to a certain point in time to try to survive events that end in their deaths. They're the only ones who retain the memory of what happened before, and work together, first as allies, then friends, and then fall in love.

Both have a school setting with the two MLs slowly discovering their crush on the other.
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Both are historical/fantasy dramas and have a storyline or plot in which Ding Yu Xi portrays the ML who is a cat/human shapeshifter.

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Both FLs are poor and outside the law (assassin vs. thief) and disguise as a eunuch to enter the palace. The emperor learns their secret and falls in love with them.

Both are light historical dramas in which the leads have a long forgotten childhood connection, the ML is now a colder, feared person, and the FL is cutesy and disguises as a boy to enter the house. Both have a love triangle.

Both FLs are spirited and a bit silly, and enter the palace disguised as eunuchs. The emperor discovers or knows their secret and falls in love with them.

Both FLs are spirited and a bit silly, and enter the palace disguised as eunuchs. The emperor discovers or knows their secret and falls in love with them.

Both FLs disguise as eunuchs to enter the palace, where a love triangle forms between her, a royal, and a nobleman.

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Both are short length historical dramas in which the one ML is in an arranged marriage with the other ML's sister. When she runs away from the wedding, he disguises himself as his sister and marries the FL in her place, a ruse which is quickly discovered by the other ML. The two decide to keep the secret for now.