Five years ago, Kang Min-jun abandoned Han Ji-woo when she told him she was pregnant. Now Ji-woo is a broke single mom with a failing bakery. Her five-year-old daughter Yuna has a failing heart and needs an 80 million won surgery in three months — money Ji-woo will never have. Then Min-jun returns, begs for forgiveness, and proposes. Ji-woo says yes, for Yuna. But on their wedding day, she finds him in bed with her stepsister Soo-ah. Humiliated in front of 300 guests, Ji-woo does the unthinkable. She walks up to the coldest man in the room — Kang Tae-hyun, Min-jun's billionaire uncle, the Devil of Seoul — and says, "Marry me." Everyone expects him to laugh. He says, "I do." One year. No love. No touching. No feelings. Just a contract. But Tae-hyun didn't choose her to save her. He chose her because her mother, Han Seo-yeon, died saving his life in a fire 25 years ago. And his mother will burn the world down to keep that secret buried.

Maya Okoro thought she was just taking a nanny job. She didn't know she was walking into a billionaire's bed. At 24, Maya is broke, brilliant, and desperate. A Nigerian-American grad student in Manhattan, she needs $10,000 in 10 days to save her mother's life. No job will pay that fast. Except one. Adrian Knight. 32. American billionaire CEO. Cold. Cruel. Untouchable. Widowed father of two impossible kids that have fired 11 nannies in 3 months. He doesn't smile. He doesn't love. Since his wife died, he has one rule: No woman in his house stays longer than a month. Until Maya. She is not beautiful in the Instagram way. She wears old sweaters, talks to his children like they are adults, prays under her breath, and refuses to flinch when he shouts. His kids adore her. His house finally sleeps. And for the first time in two years, Adrian feels something other than ice. Then he finds her diary. "I'm 24 and no man has ever touched me. Not because I am holy. Because I am scared no one will stay after." One secret sentence. And the billionaire who never wanted a woman in his house suddenly wants only one thing: Her. But Maya came for money, not love. And Adrian doesn't know how to love - he only knows how to own. When her mother's medical debt brings a dangerous man from Maya's past back to New York, Adrian must decide: Is Maya just his nanny... or the only woman he will ever burn his empire for? He hired a nanny. He found a virgin. And now he can't let her go.