The story of Princess Pyeonggang who was born as a princess but raised to be a soldier for Goguryeo. She dreams to be the first female Taewang of Gorguryeo but is confused about the new feelings experienced after meeting On Dal.

Taeyang Group is the largest Conglomerate in South Korea. The Choi family who runs Taeyang has supposedly been under a curse for a hundred years that the first bride of the eldest son will always die. When the wealthy heiress Jang Yi-kyung disappears right before her wedding to heir Choi Kang-joo , Na Doo-rim , a lookalike impostor, is brought in to take her place. Unlike the cold and calculating Yi-kyung, Doo-rim is sweet and sunny, and Kang-joo genuinely falls in love with her. As the wedding plans progress, Kang-joo and Yi-kyung's mothers both scheme and plot behind the scenes.