She was betrayed by her own sister in her previous life, and could only separate from the one she loved and marry someone else.
But they developed feelings within two years of marriage; my sister was jealous that their marriage could be happy, but she tried every means to achieve the so-called love.
Just use the relationship between your husband and your little sister to make them duel.
The heroine's husband... Died... And she herself suffered a lot,
If you leave your previous life and go to another world, you might be able to atone for your sins.