OneLastTime's activites

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Reconstructing my reading list. Webtoon where woman was transmigrated to be the hero in another world, saved it, became empress but was killed by her jealous crown prince husband. Reincarnated and married the scarred northern duke she was pen pals with in her previous life. He was also pretending to be a mad man but is actually a well read softie.

What happemed to the og best friend? Is there any closure for the original world?