The main content of the novel is that 5 years ago, Yi Qingli, who was studying piano at the National Conservatory of Music in Paris, France, received a notice to be an exchange student. She packed up her luggage and went to the Shanghai Conservatory of Music in China. On a street, she met Lin Yunxuan, who was indifferent and did not talk to others. Over time, the two fell in love, but Qingli's days as an exchange student were running out. They agreed to meet one year later... But five years later, Qingli encountered many setbacks. Fortunately, with Yin Hanxiu by her side, she returned to China. Who is the prince? Who is the knight? Who will she choose in the end......