2009: Lost Memories

2009: Lost Memories is a 2002 South Korean film set in an alternate timeline where the Korean Peninsula  is still a territory of Japan thanks to a time travel mishap in 1909. The film focuses an an agent of the Japanese Bureua of Investigation who while looking into the theft of historical relics by a terrorist organization comes to learn of the original unaltered timeline and himself goes back to prevent the action that resulted in his alternate world.

Plot
The film opens with a word crawl revealing the following alternate timeline; In the year 2009 the Imperial Provience of Chosen (the Korean Peninsula) is
 * 1909: An Jung-geun's assassination attempt against Itō Hirobumi is thwarted by a man named Inoue.
 * 1910: The Empire of Japan annexes the Korean Peninsula.
 * 1919: The March 1st Movement protests are suppressed with violence.
 * 1921: Inoue, Itō's savior, becomes Chosen's (Korea's) second governor-general.
 * 1932: The assassination of Yoshinori Shirakawa by Yoon Bong-Gil is prevented.
 * 1936: The United States and the Empire of Japan enter World War II as allies against Nazi Germany.
 * 1943: Japan annexes Manchukuo.
 * 1945: Atomic bombs are dropped on Berlin, ending World War II.
 * 1960: Japan becomes a permanent member of U.N. Security Council.
 * 1965: Japan launches its first satellite, Sakura 1 (presumably as part of the Space Race).
 * 1988: The 1988 Summer Olympics are held in Nagoya (in contrast to the city losing to Seoul in the actual timeline)
 * 2002: The 2002 FIFA World Cup is held in Japan (instead of both South Korea and Japan)

is still under Imperial Japanese rule and Japanese Bureau of Investigation (JBI) agents Masayuki Sakamoto and Shojiro Saigo thwart a hostage crisis at a museum in Keijo by a terrorist group known as the Hureisenjin. The exact motivation for the hostage situation is unknown, but during the investigation, Sakamoto discovers a museum artifact, a crescent-shaped rock known as the "Lunar Soul", found by one of the slain terrorists. After discovering that the Hureisenjin has a long history of targeting the Inoue Foundation, a group founded around the artifacts collected by the second Governor-General of Korea, Sakamoto begins to suspect the Hureisenjin were attempting to steal the Lunar Soul, although both he and Saigo are puzzled as to why a terrorist group would put so much effort into stealing historical artifacts. The Hureisenjin ambush the convoy shipping the foundation's artifacts back to Japan and take the Lunar Soul. The terrorists confront Sakamoto and Saigo in a gunfight, where Sakamoto encounters Oh Hye-rin, the organization's female leader.

Sakamoto's questioning and accusations against the influential Inoue Foundation lead to him being thrown off the case, with the execution of Sakamoto's father as a traitor for aiding in a thwarted attack by the Hurisenjin on a cargo ship in Vladivostok in 1985 being cited by his suspicious superiors. Sakamoto pursues the investigation, traveling to Harbin to learn more about the Lunar Soul, and is then suspended from the JBI. That night, an unknown assailant murders Sakamoto's mentor, Takahashi, at his apartment and he is arrested for the crime. Sakamoto, however, escapes from the JBI with the help of Saigo, who vows to be his enemy the next time they meet.

A wounded Sakamoto stumbles into the Hureisenjin's hideout and Saigo is visited by the head of the Inoue Foundation, with both learning the truth: that they are living in an alternate timeline. In 2009, a large stone temple uncovered by a joint Chinese-Korean-Japanese archaeological expedition, is found to facilitate time travel, and through its exploitation by the Japanese right-wing nationalist group Uyoku dantai, a man named Inoue travels back in time exactly 100 years and prevents the assassination of Resident-General Itō Hirobumi on October 26, 1909. Itō's survival and Inoue's knowledge of future events allows for Japan, instead of being defeated with the other Axis Powers in World War II, to instead ally with the United States against Nazi Germany; The war ends in 1945, following the atomic bombing of Berlin (instead of Hiroshima and Nagasaki). As one of the victorious powers, Japan becomes a military and economic superpower with a permanent seat on the U.N. Security Council, with its colonial empire intact. Inoue goes on to become the second Governor-General of Korea and his descendants found the Inoue Foundation, which keeps knowledge of the altered timeline limited to only the highest levels of Japan's government. However, a Korean female researcher who followed Inoue and attempted to stop him becomes the founder of Hureisenjin and passes along the story of the truth of the altered timeline, with the hope that the original timeline can somehow be restored.

Knowing about the altered history, Sakamoto allies with the Hureisenjin, who have located the temple stone and are planning their final attack. However, the JBI raid their hideout and kill almost everyone before being wiped out by an improvised explosive. Carrying the Lunar Soul with them, Sakamoto and Hye-rin escape to a tanker ship where the Inoue Foundation's artifacts are being held. They find the temple stone and place the Lunar Soul in it, which activates in the middle of a gunfight with the JBI. Hye-rin is killed, leaving Sakamoto as the only person left to fix the timeline. Sakamoto sends himself to Harbin in 1909, but is pursued by Saigo, who wants to retain the current timeline (Saigo is warned that if the original timeline is restored, his wife's family will almost certainly die in the Atomic bombing of Hiroshima). Sakamoto wounds Saigo before heading to the railway station where the assassination is supposed to occur. He is about to stop Inoue from killing An, but Saigo once again confronts him. Sakamoto kills Inoue, then guns down Saigo to prevent him from shooting An; An then assassinates Itō, as in the original timeline. Later, Sakamoto is seen planting explosives to destroy the temple stone, when Hye-rin walks up to him. It then becomes clear that she was a female Korean researcher in the original timeline, who had followed Inoue when he traveled back in time. Although this Hye-rin (as opposed to the Hye-rin in the alternate timeline) and Sakamoto have never met, they immediately form a special bond.

Back in 2009, it becomes clear that the original timeline has been restored, and at the Independence Hall of Korea, a young boy Sakamoto had met in the alternate timeline sees numerous pictures of Korean heroes and leaders, including one of Sakamoto and Hye-rin together smiling.

Production
The film is a co-production between Japan and South Korea timed to coincide in release with the 2002 FIFA World Cup which was held in both Japan and South Korea. Though despite this co-production the film is still heavily riddled with Anti-Japanese sentiment. The film was to be a loose highly modern adeptation of Bok Geo-il's 1987 novel "Looking for an Epitaph". The author of the novel upon which the film is based sued the producers over the final product and had his name removed from the credits.

Reception
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