emeraldarrows

One is the original drama and the other is a short spin-off that expands part of the story and has the same cast.

One is the original drama and the other is a special mini-series drama spin-off with the same characters. The mini drama is very cute and funny.

It's the fourth film in the series and continues the story.
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Both are special episodes for Cherry Magic.
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Both are short dramas in which a couple breaks up then reunites years later. In between, the FL has given birth to their child that the ML is unaware exists.

Both are light dramas with a modern day FL in a historical setting, and a prince ML. Both princes suffer from illness or poisoning.

Both are short length dramas with a modern day FL in a historical setting.
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Both dramas have a poisoned ML and a FL from another time who is the only one who can cure/ease his condition.

Both are historical setting with a long-term poisoned ML who can only be treated or cured by the FL. Both MLs are royal.

Both are short length dramas with VR elements in which a modern day FL enters a historical world and falls in love with the royal ML.

Both have a doctor FL from modern day in a historical setting. Both MLs are royal and have an illness (poisoned vs. medical condition) only the FL can cure. Both dramas are relatively to very short.

Both are short dramas with a modern day FL entering a fictional historical world and falling in love with the royal ML.