The Fox Fairy (2021)

Both are mini dramas that are historical/fantasy genres. Both MLs are generals, the FLs are quirky, endearing, and have something unique about them (they aren't human vs. they're a time traveler), and both couples get married at the beginning of the series, then fall in love.

Both are short and sweet historical love stories between a human and a fox spirit.
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Both are fluffy short dramas with a general ML who pretends to be sick to protect himself and who ends up married to the FL.

Both dramas portray a relationship between a nine-tailed fox and a human.
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Both are historical/fantasy mini dramas with the same actress as the FL. In both, she is a fox who falls in love with the human ML.

Both dramas are about fairies coming to the human realm.
A little fox demon has come to the mortal world to repay a debt. She takes the place of the bride in marrying the cold general Gu Yu Fan. Their relationship which starts from marriage turns into love.

Gu Yun Fan is hailed as the god of war of Tiansheng Kingdom. He sustained injuries after leading an army to defeat invaders from Beirong. In order to ensure that the Gu family bloodline will continue, the emperor orders an arranged marriage. To repay her benefactor, little fox demon Xia Jiu'er marries into the Gu family. After many twists and turns, Gu Yun Fan and Xia Jiu'er reveal their sincere affection for each other. Can they break through the boundaries between humans and demons to be together?

Both are short somewhat fluffy and fast paced romantic Chinese dramas. The couple are a human and a nine tailed (or half) fox.