The CEO's substitute ex-wife mainly told the story of the protagonist, Ye Yunfeng, meeting a woman named Lin Wan 'er after his divorce. After the two met, they fell in love, got married, and owned a law firm. However, Lin Wan 'er was framed by Ye Yunfeng's good friend to become his substitute ex-wife when Ye Yunfeng's career was flourishing. At the end of the story, Ye Yunfeng successfully saved his marriage and family, while Lin Wan 'er chose to leave this world, leaving behind a sad story.