It was a cold winter in Northeast China, and there was a lot of traffic on the street. A man was wearing a Korean-style slim-fitting windbreaker, slim-fitting black shiny pants, and a cigarette in his mouth. Walking down the street with a guitar bag on his back. His name is Zhang Yu, a young man who loves music. Coming from an ordinary family, he can only make a living by being an extracurricular music teacher for others. This seemingly ordinary boy will bring you an extraordinary story...