Kang A-ra, a daughter-in-law, receives two devastating blows on her tenth wedding anniversary: the revelation of her husband’s affair and a diagnosis giving her only one month to live. She seizes her mother-in-law’s 300-billion-won slush fund as a "severance package," tying her fate to it, and brings down two chaebol families with an uncanny knack for making money—where every investment she tosses aside casually yields returns many times over. Her contract with a chaebol heir—who became a butler over that 300 billion won—blossoms into love, and the woman who once staged her own death returns as "Rachel Kang" to settle the final score.