My Stepsister Insisted on Swapping Marriages? I Married Into a Powerful Family, and Now She’s Sobbing

[Both leads reborn + sweet and satisfying + swapped marriages + both romantically inexperienced + face-slapping] In her previous life, her stepsister stole her marriage, married into a wealthy family, and ended up being cast aside and sent away with nothing, her future in ruins. Meanwhile, Song Nanyi married a poor young man, but luck was on her side. She became a wealthy man's wife and reached the pinnacle of success. Driven to desperation, her stepsister committed a wicked deed, causing them both to be reborn. From the start, her stepsister opened her eyes and immediately latched onto the poor young man, leaving Song Nanyi to marry into the wealthy family. Song Nanyi gladly agreed. After all, her husband in her previous life was a scumbag. She stood by him through hardship, only for him to grow rich and keep entangling himself with his first love. As for the Shi family, as long as she kept her wits about her, she could marry in and live like a wealthy man's wife from day one. But... Only after the wedding did she discover that the sickly husband everyone talked about had been in love with her all along. She had the most stunning beauty in the capital's social circles, the courage to act decisively, and a mind of unmatched cunning. He doted on her endlessly, and she could lie back and still win at life. Three children in two years, with love that never fades. Meanwhile, her stepsister, who married the poor young man, was driven to a mental breakdown by her husband's old flame and committed to a psychiatric hospital. In the end, she died at Song Nanyi's hands...