South Korea's secret nuclear weapon mysteriously disappeared and a plane carrying a military handheld device crashed in China. The South Korean side received the news that a dangerous person suspected of being nicknamed "Equator" (Zhang Zhen) with an assistant "messenger" (Wen Yongshan) would conduct a secret arms trade in Hong Kong. South Korean weapons expert Cui Min (Chi Jin Xi) and special agent Park Yuchul (Cui Shiyuan) were ordered to investigate. Li Yanming (Zhang Jiahui), head of the Hong Kong Anti-Terrorism Secret Service, and Inspector Fan Jiaming (Yu Wenle) assist South Korea in finding weapons, while nuclear physics professor Zhao Zhiren (Zhang Xueyou) is also invited to assist in the judgment. The weapon was quickly recovered, but there was still a potential crisis. Just when the Hong Kong and South Korean police decided to return the weapons to South Korea, the senior officer of the mainland Security Bureau (Wang Xueyi) suddenly appeared with her assistant Miss Yuan (Feng Wenjuan), and the three parties were caught in a circle. It turned out that there was someone else in the "equator". And the plot of their gang also began to carry out.
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