In Shanghai in the 1930s, four girls, Yao Xiaodie, Lulu, Fengping, and Lianxi came to the world because of the same love of singing. Together. Yao Xiaodie was abandoned since she was a child, and she wanted to avenge her father by killing her enemy Lu Han. While riding the car that day, Yao Xiaodi accidentally met Shen Jiahao, a young man who played the saxophone. Since then, the two have been in frequent contact because of performances, and gradually a different kind of affection has developed between the two. However, Yao Xiaodi never forgot the revenge of killing her father, so she reluctantly gave up her relationship with Shen Jiahao. Afterwards, after going through some ups and downs, Yao Xiaodi realized that she misunderstood Lu Han as an enemy. When the country was invaded by foreign enemies and trampled by Japanese invaders, Yao Xiaodi put aside her personal grievances and joined Lu Han in fighting against Japan. Finally, with the help of Lu Han, they found their biological mother and recognized each other. Fengping, on the other hand, fell in love with a man who was fond of gambling. After Fengping gave birth to her son Hope, she finally died in a foreign country with her husband, which is embarrassing. Lianxi got acquainted with the young man Yitian, and finally she bravely followed Yitian to become a revolutionary youth. Lulu's fate was also full of twists and turns. She contracted a serious illness and thought she would die, so she planned to commit suicide to kill everything. It was finally discovered that she was not terminally ill, and Lulu's narrow escape rekindled her hope of life, and finally she was able to marry into a wealthy family. The destinies of the four sisters are different, the only constant is the affection between them