Miyoung was killed in her past life by the person she loved and trusted the most.
Thus, Death pitied her. Death, wanted to give her a second chance. Miyoung takes Death up on his offer, wanting to avenge herself.
Miyoung is reborn as a young lady during the Silla Dynasty. When she discovers that she literally, can't walk in the traditional dress of Korea, a hanbok, she decides to cross dress.
She heads to the capital in search of a job. She finds that the palace is holding a competition. A competition to select the a group to be the next Hwarangs as well as the next bodyguards of the prince.
But, Miyoung keeps in mind that the person she loved the most in her past life, is a criminal in her life. While Miyoung gets adjusted to life in the palace and meets a group of new friends, she must help the princes find the criminal, and pray that her true identity is not found out.