Xiao Sheng, born into a family of musicians, had once been a prince among men, blessed with extraordinary talent. But when he was twelve, he was suddenly told that he had been switched with another baby at the hospital. Xiao Tian, the professor's biological son, took his place as the new prince, while Xiao Sheng was forced to return to the family he had originally belonged to. After enduring the pain of separation, Xiao Sheng gradually found peace again with the support of his family.
He thought he would spend the rest of his life away from the piano. Then, after a misunderstanding caused by a drunken night, Xiao Sheng became a pawn in A Zhi's revenge plot. He deceived A Cheng to help A Zhi get revenge. At the same time, Xiao Tian, who had once exchanged identities with him, reappeared in Xiao Sheng's life. The two became partners, bound together by music. After an initial period of confrontation and misunderstandings, they gradually came to understand each other. Xiao Tian fell in love with Xiao Sheng, unaware of his true identity. But Xiao Sheng remained wary of Xiao Tian and was reluctant to acknowledge his own feelings.
Only after Xiao Tian learned the truth of Xiao Sheng's past were they finally able to set aside their prejudices and be honest with one another. But then Xiao Sheng accidentally learned the truth behind A Zhi's revenge plan. To save A Cheng, the younger brother A Zhi had sacrificed, Xiao Sheng chose him over Xiao Tian. Xiao Tian, who had endured separation and loss since birth and was sensitive by nature, responded to Xiao Sheng's choice in the most extreme way. Seeing Xiao Tian on the brink of death, Xiao Sheng regretted his decision. But it was too late to undo what had happened. Xiao Tian later married someone else and moved far away with his wife and child, leaving Xiao Sheng alone to wait and watch. When Xiao Sheng sat down to play the piano again by himself, he realized that he had lost his partner forever.
