"Pujiang Secret War: The Legacy of the Lotus" is set in Shanghai after the victory of the Anti-Japanese War in 1945, and unfolds a secret war between the Kuomintang and the Communist Party and various forces around the "Lotus Project". Lin Shuyue, who returned from Harvard, discovered that enemy-produced drugs were missing, and while tracking down with Song Shiyu, he was involved in the struggle between Chu Huaizhou, Qian Luo, Chu Yan and other underground parties and the Kuomintang officer Lu Jingyan. Lu Jingyan embezzled drugs in exchange for gold bars, forged signatures, set traps, and persecuted those who knew about it. Lin Shuyue and others dealt with Lu Jingyan at Shikumen, docks, warehouses and other places, exposing his use of the "Lotus Project" to cover up the crime of collaborating with the enemy and laundering money. In the process, Chu Huaizhou, Qian Luo and others sacrificed themselves to protect the ledger, and Lin Shuyue fought tooth and nail to deliver the evidence. Finally, when the People's Liberation Army arrived, Lu Jingyan's conspiracy was exposed, and the truth about the "Lotus Project" was revealed. The secret war ended with the dawn, showing the bloody struggle of faith and sacrifice in troubled times.