Reborn on the Day of the Marriage Swap, I Wed the Short-Lived Heir and Fight for a Noble Title

[Both leads reborn + marriage swap + household intrigue + devoted husband + punishing scumbags + leads who speak their minds + mutual devotion] Cui Shiyuan's mother died young, and her father doted on his concubine while neglecting his wife. Things were disastrous from the start. Her finest courtyard was taken away, her maid was sent back to her maternal family, and she couldn't get her hands on her dowry. Even her marriage was changed on a whim. Her ambitious half-sister threw a tantrum and took the marriage from her. With a single claim that she couldn't bear to part with her elder sister, their father made Cui Shiyuan marry in her place, to the son of a concubine who had conspired with her half-sister: a vile man who would one day favor his concubine over his wife. In the Lin'an Marquis household, her half-sister was the bright moon in the sky, while Cui Shiyuan was filthy mud in a swamp. In the Jingguo Duke's household, her half-sister was the honored heir's wife, while she was the wife of a son of a concubine, free for anyone to bully. Cui Shiyuan fought with everything she had to earn her husband's respect, her mother-in-law's affection, her aunt's approval, her father-in-law's esteem, and the servants' support. After the heir died unexpectedly, her husband was appointed heir to the dukedom, becoming a rising star at court with power and influence. Consumed by jealousy, her half-sister slept with him. Then, right as Cui Shiyuan was being invested as a First-Rank Lady of Honor, she drove a hairpin deep into her heart. What she didn't know was that everything the son of a concubine had was given to him by Cui Shiyuan: money, power, and influence. Without her, Pei Huai was nothing. When Cui Shiyuan opened her eyes again, she had returned to the moment before boarding the wedding sedan. This time, she watched coldly as her half-sister rushed into the fiery pit Cui Shiyuan had entered in her previous life, then turned and married the heir who had left for the frontier on the very night of his previous wedding.