Lee Jungwoo is a man with a good heart and kind nature. One day, while following a pigeon that he had helped with a leg injury, he stumbled upon the angelic figure of Jung Hae-in taking a nap. Jungwoo couldn't resist the urge to approach Haein, who he believed to be his destiny. However, his heart sank when he learned that Hae-in was only interested in men with completely opposite personalities. Determined to win Hae-in's heart, Jungwoo decides to transform himself into the perfect "Kwang-gong" type.
Eight years later, the two run into each other at a bookstore. Jung-woo, now a mining engineer, and Hae-in, who has returned from studying abroad, start a competition to win each other's hearts.