A ship carrying a nuclear satellite navigation device is strangely missing off the sea 220 kilometers northeast of Keelung Port in Taiwan. an investigation confirmed that he was seized by a pirate gang headed by Xin (Zhang Dongjian). In 1983, the young Xin fled with his family from North Korea to South Korea to seek political asylum, but was rejected by the South Korean government, except Shin and his sister Mingzhu (Lee Meiyan) were killed. The brother and sister have lost contact since then, and they later became pirates, and their hatred for South Korea grew day by day, which eventually led to the hijacking of nuclear warships. For many years the letter has been looking for the whereabouts of the sister, the South Korean Ministry of Defense to find out the details, sent a senior naval officer Jiang Shizong (Lee Zhengzai) to launch a manhunt. Through the tip that Jiang Shizong found out that the pearl is now in Russia, in contact, Shizong produced pity and contradictions at the same time. At the same time, the letter also gets the whereabouts of the pearl, and the two men will have a life-and-death struggle.
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