Cha Shina lives alone, caring for her sick grandmother while taking the place of her con-man father. She works tirelessly to cover overwhelming hospital bills and living expenses, but instead of escaping poverty, she finds herself pushed further to the edge of a cliff. Then, Yoo Jinhyuk, the vice president of Cheonsan Group and the eldest son of the chairman, appears before her. To gain an advantage in the successor race, Jinhyuk proposes a contract marriage to Shina, promising her a huge sum of money in return. Shina accepts his proposal just to survive, and Jinhyuk chooses her for his own purposes. Starting from completely different reasons, their contract marriage gradually stirs up a passionate current between the two...