The beacon fire of the Anti-Japanese War was raging, and the city of Shanghai was struggling in the smoke. Lin Yu, a passionate young man, resolutely joined the hidden front with his deep hatred for the invaders and infinite loyalty to his motherland. With extraordinary courage and outstanding wisdom, he successfully sneaked into the Japanese intelligence agency. In this world full of danger and deception, Lin Yu is like a dark star, silently collecting intelligence on the enemy. Here, he met Shen Yue, a Communist Party member who was also lurking. The two joined hands and launched a thrilling secret battle in the heart of the enemy. They took risks time and time again to deliver intelligence and provide key support to the anti-Japanese organizations. However, their actions gradually aroused the suspicion of the Japanese army, and a life and death battle was about to begin. In these burning years, can they stick to their faith and play passionate music for the victory of the Anti-Japanese War?
