emeraldarrows

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Same story, one is a movie adaptation, the other a tv adaptation.
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Both have the same actor and actress as the main couple.
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Both couples were in love, then ML seemingly betrayed the FL, harming her or her family. Years later, with ML married to someone else, they meet again, and he treats her cruelly while still seemingly in love with her.

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Both are mini dramas in which the modern day FL time travels to the 1980s and finds herself marrying the ML and dealing with in laws.

Both are about the real world FL entering a fictional game-like world where each level brings her a new possible love interest and continues to make her cross paths with the ML who she falls in love with.

Both FLs come from the real world into a fictional, game-like world set in a hotel where they must complete various tasks and fall in love along the way.

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.