The story takes place in the capital of North Korea in 1940. Zheng Sulu (Han Hyo-joo) was the most famous singing girl at the time. She had a beautiful face and outstanding talents. She was the one that the talented men wanted to spend the night with. Xu Yanxi (Qian Yuxi) was a good friend of Zheng Sulu since childhood. Like Zheng Sulu, she was also a singing girl. The appearance of a singing girl was infinitely beautiful and sought after by thousands of people, but in fact it was a profession full of hardships and sufferings. The two sisters supported each other and accompanied each other, and their friendship was very deep. Jin Yunyu (Yoo Yeon-seok) was a popular composer who was deeply loved by the public at the time. By chance, Zheng Sulu heard a new song created by Jin Yunyu and liked it very much. She wanted Jin Yunyu to dedicate this song to her to sing. However, in Jin Yunyu's heart, the person who could perfectly interpret his song was Xu Yanxi, who was not as famous as Zheng Sulu.