Both are mini dramas with the same actor and actress as the ML and FL.
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Both are mini dramas with the same actor and actress as the ML and FL.
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Both are mini dramas with the same actor and actress as the ML and FL.
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Both are mini dramas with the same actor and actress as the ML and FL.
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Both are historical comedies set within the royal palace, with both FLs shaking up the ML's life with their unconventional ways.

Both MLs are involved in stopping some crime and vanish for years, returning with a new identity and pretending not to know the FL despite becoming close to her again. Both MLs have an identifiable scar on their sides.

Both begin with the FL transferring to a new school and ending up clashing with the school bully/popular guy who slowly begins to fall for her. Both have a love triangle between the leads and the ML's best friend.

Both are xianxia dramas in which one of the leads is a magical fox who appears in both animal and human form in front of the other lead without them realizing it's the same person at first.

Both MLs are magical nine-tailed foxes and the FLs are humans who accidentally swallow an object that is part of the ML's power. As a result, the ML ends up living or staying with her to gain it back.

Both are about a human FL who ends up living/staying with with the supernatural ML after she accidentally kisses him and swallows his magical object that he wants back.

Both MLs are fox spirits whose objects relating to their power are accidentally swallowed by the FL, requiring the ML to stay with the FL to try to get it back.

Both dramas portray a relationship between a nine-tailed fox and a human, and are set in an ancient time period.