Iseohee, a third-generation chaebol, was enjoying a carefree existence—living off her affluent father and splurging without any concerns. Marriage? It wasn’t even on her mind. However, one day, Chae Seunghyun, an old friend from her study-abroad days, unexpectedly proposes: "Let’s get married, Iseohee. You and me." A standard political marriage in their society—nothing out of the ordinary. Given his looks and credentials, she thinks, why not? What she didn’t foresee… was his mother: Madam Hong, infamously known as the Lee Soon-ja of the elite, a woman notorious for intimidating her daughters-in-law. Iseohee had always felt sympathy for anyone who would marry into that family. It turns out, she is that person. “You’re the perfect candidate for my wife.” “Of course, that includes being able to handle my mother.” “You insane bastard.” From a pampered slacker to the future daughter-in-law of a matriarch from hell, Iseohee is confronted with the biggest crisis of her life. Will their marriage withstand the turbulence—or even reach the altar?