In January 1933, the Japanese army captured Shanhaiguan Pass and occupied Chengde in March, making the anti Japanese situation in North China precarious. The forces of multiple countries in Shanghai were glued together, and the undercurrents were surging. The special agents of Qingshan Military Academy watched and cooperated with Tian Qiaojie and his lover Tan Zhongwen to complete the mission of their mentor Pu Cong. After that, they were secretly arranged to carry out the assassination mission targeting the Director of the Japanese Economic Department, Hiroshi Kamiya, alone. Looking forward to completing her mission with injuries, she was framed by Pu Cong and imprisoned. In dire straits, she was rescued by excellent soldier Luo Xingming. Under the guidance of Luo Xingming, Gu Pan went through trials and entered the secret organization "Nest" in an attempt to find out the reason for her framing. Amidst the peeling of the cocoon, the truth gradually surfaced, hoping not only to uncover the spy organizations hidden deep within the Kuomintang, but also to gradually expose the dark and corrupt side of the Nationalist government. Gu Pan gradually leaned towards the Red Revolution in the pursuit of justice, using the code-name "Seahorse" to transform into a communist warrior and becoming a partner with Luo Xingming. Finally, the "Nest" was destroyed and the Japanese army's "Darkness Plan" was uncovered.
