Both are historical/mysteries dramas featuring bromances where the leads are often on opposite sides.

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One is M/F and the other BL but both are about the love story between a sweet, innocent robot and a somewhat withdraw human. Both robots are created as companions, with the creator objecting at first to the relationship. Both leads separate close to the end for several years, before a happy reunion.

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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.