It's the Chosen (Josean) era, and Jung Minah is the servant of the Na family. Their daughter, Na Chorong, is proposed to marry the Crown Prince, Do Kyungsoo.

One day, the abnormally beautiful Minah goes to the Do's family to deliver presents. But she bumps into the Crown Prince, and they immediately fall for each other. 

But she's a lowly orphan servant, and he's The Crown Prince, already having an arranged marriage. Can they break the rules and be open for their feelings, or will their love remain forbidden? 

Jung Minah: 

A pretty servant of the Na family. She's an orphan, yet is always optimistic. She has a brother who lives in another part of past Seoul. She's beautiful, envy of the other family girls. With a happy personality, full lips, rosy cheeks, and big beautiful brown eyes, who wouldn't fall for her? 

Do Kyungsoo: 

A handsome Crown Prince of Chosen. He has heart shaped lips, big eyes,and a beautiful smile. It's every girl's dream to marry him. Dispite geing of such royalty, he's carefree with his friends. He has an angel's voice, so who wouldn't marry him? 

Others including the Na family, Do family, Exo-K, etc.