Love Better Than Immortality (2019)

Very different setting/plot but similarities in characters.

ML has a more unusual personality (more like a SML). It's not obvious at first who FL will end up with as she initially loves the other male character. FL is optimistic and very romantic.

- You didnt know who is the main lead (if you dont watch spoiler, poster, etc)
- Possessive male lead

In both dramas, a modern/future FL enters a historical world and becomes involved with the villain.
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Both shows are cute funny and while The Life of the White Fox takes place in the present, but at certain times we are taken to the past, in Love Better than immortally the girl ends up going from the future to the past. In both girls they are innocent and have a strong morality, and the boys are strong and feared by others. In both shows the question is the same "Love or immortality?"
- In both the male leads have supernatural powers

Both dramas involve a main character going into another world. In Love Better Than Immortality the female lead goes into another world to find love. In Mr. Bad the male lead is summoned out of a fictional world to save the female lead. The female lead thinks she is in love with someone else at the beginning of the drama.

FL's spirit is in another girl's body.
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Both have female lead time travel
Both havd a struggling romance with happy end
Male lead falling in love first