emeraldarrows

Both are a romance between an older FL and a younger ML. Both MLs fall first and pursue the FL who is hesitant due to their age gaps/his career.

Both are fantasy/historical dramas with a similar feel. Both FLs have a heart condition which means they have to be careful about falling in love/becoming involved with the ML.

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Both are Republican Era dramas in which the FL approaches the ML as part of her revenge plot of taking down his family who destroyed her family.

Both are Republican Era dramas in which the FL is trying to right the wrongs done to her family, and the ML is a somewhat dangerous figure who she becomes involved with.

Both are Republican Era dramas centered around the FL's revenge plot.
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Both are Republican Era mini dramas in which the FL is out for revenge and becomes entangled with the ML in the process.

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Both are historical dramas in which the FL uses scents/fragrances and the ML is in possession of one she needs.

Both are historical dramas in which the couple briefly met years before, leaving an impression on the FL. Later on, she accidentally marries the ML, joining his large house, and discovers he's now foolish/pretending to be foolish.

Both are historical mini dramas with a tough FL and a ML who pretends to be foolish.
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Both MLs were abducted as a child and bonded with the FL. In present day, they don't recognize the FL as the little girl from their past, but their trauma/phobia is eased whenever she's around. The two live together.