For many years, the Kingdom of Cheongrim was the wealthiest and most powerful on the continent. However, their era of peace came to an end with the invasion of the golden race, whom they had mocked as savages.\n\nThe blue race, now reduced to slaves and impoverished, and among them, a girl named Haesoo was born. Abandoned as a baby, she didn't even know who her parents were. For Haesoo, her adoptive parents, who raised her like their own daughter, and their biological daughter, Haeryeong, were her entire world.\n\nThen one day, due to a ball that accidentally crossed into someone else's yard, a new connection began in Haesoo's life...