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Gao Zhenlin, a military spy lurking deep in Yan'an. Life in Yan'an made him gradually sympathize with and lean towards the Communist Party. He hopes to live like this, forget his identity, be a "communist", a person beneficial to the revolution, and an ordinary person. But due to fate, Yan'an sent him to sneak into the military to carry out the task of cooperating with the "Gucheng", a senior underground party agent of the Chinese Communist Party. His dual identity was awakened. He not only had to cooperate with the "Ancient City" to launch desperate espionage battles with the Kuomintang, but he also had to be constantly vigilant. If he made the slightest mistake, he would be regarded as a traitor by Yan'an and a mole by the military commander. The struggle between loyalty and conscience, the struggle between reason and faith, he cannot control his destiny, he can only hide and stay hidden all his life.