During the Joseon Dynasty, lowborn Chae-sun challenges the rule that states only men allowed to sing while navigating devotion to her teacher and the demands of the king's father.

During the Joseon Dynasty, singing teacher Shin Jae-hyo clashes with his school's best singer over the lead role in a new opera. At the same time, lowborn and brothel-raised Chae-sun aspires to take up the male-only professional of singing. Shin shuns Chae-sun's pleas for audition. but when she disguises herself as a man and performs, Shin is convinced of her talent and accepts his school's first female student. However, Shin's attempt to find her a place in a royal ceremony leads him to be incarcerated by Daewongun, the king's father, and a desperate Chae-sun finds herself striking a deal with him in an effort to save her teacher.—CJ Entertainment