In the early days of the founding of the People's Republic of China, latent spy activities were rampant. Former special scout Shen Weixi was forced to accept a new identity due to an almost impossible task - to infiltrate Gu Yanqing, the director of the Secrecy Bureau, and obtain a list of spies lurking in our high-level ranks: a weak widow with a simple background and to honor her late husband. Relying on her extraordinary powers of observation and psychological quality, she navigates the dangerous enemy nest, and every time she delivers information, she walks on thin ice. As the mission progresses, she discovers that Gu Yanqing is far from a simple enemy. He is also struggling under his cold appearance. The two develop a dangerous and subtle connection in temptation and counter-testing. When Shen Weixi is about to touch the core secret, a bigger trap emerges: the "list" she is looking for may itself be the ultimate bait for our intelligence network. She must make the final choice between personal emotions, the trust of her comrades, and the faith of her family and country.