In her previous life, Mo Yunshu spent her entire fortune supporting the impoverished scholar Song Yanchen until he rose to become prime minister, only to be cruelly harmed by her younger half-sister, Mo Yunrou. Reborn on the day their marriages are decided by drawing lots, she discovers that Mo Yunrou has also been reborn. Mo Yunrou is determined to seize Song Yanchen's marriage match, obsessed with becoming the prime minister's wife. Having long seen through Song Yanchen's true character, Mo Yunshu calmly gives up that match and chooses the stern yet astute Xiao Jueyi. She secretly offers strategies to help repel the enemy, earning Xiao Jueyi's admiration. Facing her family's favoritism and her half-sister's constant comparisons and provocations, Mo Yunshu remains composed and asks only for a peaceful life. In the end, she and Xiao Jueyi embark together on a splendid future, while Mo Yunrou, whose obsession leads her to make the wrong choice, meets a tragic fate.