Zhang Yi Xing is a world-known classical violinist, whose true passion is guitar. He's very shy and quiet.

Li Xia Tian (OC) is a world-known pianist, and she is just as quiet as he.

They attend the same university, even share a few classes, but they've never spoken to each other. After two years of Yi Xing secretly accompanying  Xia Tian when she practices piano, and Xia Tian wondering who creates the beautiful harmonies, they finally meet each other. Will their harmonious friendship grow into something more?