Su Yu accidentally transmigrates into a novel, becoming the wicked stepmother who is destined to die a tragic death in an old-fashioned historical story. The original owner mistreated her three young stepchildren and plotted to murder her husband, ultimately meeting a miserable end as a disposable villain. Determined to rewrite her fate and save herself, Su Yu completely abandons the original owner's wicked ways. She treats Chu Li, who has been poisoned, tenderly cares for his emotionally neglected children, and uses her modern medical knowledge and remarkable wisdom to mend their broken family and steadily turn their predetermined tragic fate into a happy one.