In the autumn of 1936, there was an undercurrent in the Shanghai Concession. Yang Ranran, a cryptographic genius who returned from studying abroad, got involved in a life-and-death chess game between military commanders and Japanese spies to avenge his father. Little did he know that the beauty on his bed, Wei Kexi, was the "Red Rose" he was ordered to track down. When love becomes the most deadly password, every step of the game points to the abyss of backlash.
