Both are short length dramas with love story between a manga character and a person from the real world.

Both are short length dramas where the main couple are a person from the real world and a manga character.

Both dramas are set within the world of a manga with a heroine trying to change the story.
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In both, the FL is from the real world and enters a manga, falling in love with a character in the story. Eventually, the ML leaves the comics and enters the real world.

Both are short length dramas set in the world of a comics, with a villain ML and a FL who attempts to change the story to her advantage.

It continues and completes the story.
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One is the original story, the other a sequel movie about what happens to one of the characters after the events of the drama.

It continues the story.
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It continues the story.
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One is the original drama, the other a short epilogue to the drama.
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Both are different retellings of the same story.
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One is the original drama, the other is a short epilogue which gives a happy ending for the main couple.