Kim Jung-hwa is a young and sincere middle school teacher, who has little interest in money. She is also extremely warm-hearted and loves to help other people. When she helps carry an elderly man's belongings from the train to another location, the elderly man is extremely thankful. This grandfather turns out to be the extremely rich owner of a well known conglomerate. His grandson, Kang Dong-won is a quick-tempered businessman who rivals his grandfather, but in an almost comical way. In an order to "tame" his favorite grandson, the grandfather agrees to give his entire fortune to the person who marries Jung-hwa, therefore forcing Dong-won to meet the girl whom his grandfather chose. Although at first Jung-hwa and Dong-won don't get along because of Dong-won's extremely cute but bad temper, their arguments bring them closer together. Dong-won starts to get jealous when Jung-hwa's fellow teacher starts liking her too. Through the clever conditions that Dong-won's grandfather makes, he starts a relationship he does not look forward to. However, what looked like a relationship that would 99% not work out, turns out to be the "perfect" match, the 1% chance.