Kang-jae grew up under a jobless, gangster father. When Kang-jae accidentally meets Lee Dae-hae (Suh In-sok) and his son Sun-mo, he feels more attached to Dae-hae than to his own father. Through Dae-hae and Sun-mo, Kang-jae learns the basics of magic as well as what fatherly love really means. Sun-mo, on the other hand, has a love-hate relationship with his father, who only cares about magic and nothing else. Meanwhile, Sun-mo is heartbroken by Dan-young, who falls in love with Kang-jae. Before that Dan-young was living with Sun-mo, mistakenly thinking that he is her long-lost brother before she was adopted. Yun-jin, Dan-young’s stepsister, instantly falls in love with Kang-jae and Kang-jae decides to marry her, not for love but for the sake of fulfilling his own ambitions at the price of spurning Dan-young.

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 Kim Jung Hwa, therefore forcing Kang to meet the girl whom his grandfather chose. Although at first Kim and Kang don't get along because of Kang's extremely cute but bad temper, their arguments bring them closer together. Kang starts to get jealous when Kim's fellow teacher starts liking her too. Through the clever conditions that Kang's grandfather makes, Kang starts a relationship he does not look forward too. However, what looked like a relationship that would 99% not work out, turns out to be the "perfect" match, the 1% chance.