Question: Who led a successful Marxist revolution in the country neighboring the country where Deoksancheon is located?

<P0-S0> Deoksancheon is a river of South Korea. <P0-S1> It is a tributary of the Hongcheon River in the Han River system. <P0-S2> The river is located in a high altitude area. <P0-S3> There are alluvium deposits along the lower end of the stream. <SEP> <P1-S0> at the start of the 20th century, the russian empire was an autocracy controlled by the tsar, with millions of the country's largely agrarian population living in abject poverty, and the anti-communist historian robert service noted, ``poverty and oppression constituted the best soil for marxism to grow in ''. <P1-S1> the man responsible for largely introducing the ideology into the country was georgi plekhanov, although the movement itself was largely organised by a man known as vladimir lenin, who had for a time been exiled to a prison camp in siberia by the tsarist government for his beliefs. <P1-S2> a marxist group known as the russian social democratic labour party was formed in the country, although it soon divided into two main factions: the bolsheviks led by lenin and the mensheviks led by julius martov. <P1-S3> in 1905, there was a revolution against the tsar's rule, in which workers' councils known as`` soviets'' were formed in many parts of the country and the tsar was forced to implement democratic reform, introducing an elected government, the duma. <SEP> <P2-S0> South Korea is located in East Asia, on the southern half of the Korean Peninsula jutting out from the far east of the Asian land mass. <P2-S1> The only country with a land border to South Korea is North Korea, lying to the north with 238 kilometres (148 mi) of border running along the Korean Demilitarized Zone. <P2-S2> South Korea is mostly surrounded by water and has 2,413 kilometres (1,499 mi) of coast line along three seas; to the west is the Yellow Sea (known in Korea as West Sea), to the south is the East China Sea, and to the east is the Sea of Japan (known in Korea as East Sea). <P2-S3> Geographically, South Korea's land mass is approximately 100,032 square kilometres (38,623 sq mi). <P2-S4> 290 square kilometres (110 sq mi) of South Korea are occupied by water. <P2-S5> The approximate coordinates are 37 ° North, 127 ° 30 East. <P2-S6> Notable islands include Jeju Island (Jejudo), Ulleung Island (Ulleungdo), and Liancourt Rocks (Dokdo, known in Japan as Takeshima). <SEP> <P3-S0> Alexandra Kim, a Korean who lived in Russia, is sometimes credited as the first Korean communist. <P3-S1> She had joined the Bolsheviks in 1916. <P3-S2> In 1917, Vladimir Lenin sent her to Siberia to mobilize Koreans there against the counter-revolutionary forces and the Allied Expeditionary Forces. <P3-S3> In Khabarovsk Kim was in charge of external affairs at the Far - Eastern Department of the Party. <P3-S4> There she met with Yi Dong - Wi, Kim Rip and other Korean independence fighters. <P3-S5> Together they founded the Korean People's Socialist Party, the first Korean communist party on June 28, 1918. <SEP> <P4-S0> born to a moderately prosperous middle-class family in simbirsk, lenin embraced revolutionary socialist politics following his brother's 1887 execution. <P4-S1> expelled from kazan imperial university for participating in protests against the russian empire's tsarist government, he devoted the following years to a law degree. <P4-S2> he moved to saint petersburg in 1893 and became a senior marxist activist. <P4-S3> in 1897, he was arrested for sedition and exiled to shushenskoye for three years, where he married nadezhda krupskaya. <P4-S4> after his exile, he moved to western europe, where he became a prominent theorist in the marxist russian social democratic labour party (rsdlp). <P4-S5> in 1903, he took a key role in a rsdlp ideological split, leading the bolshevik faction against julius martov's mensheviks. <P4-S6> encouraging insurrection during russia's failed revolution of 1905, he later campaigned for the first world war to be transformed into a europe-wide proletarian revolution, which as a marxist he believed would cause the overthrow of capitalism and its replacement with socialism. <P4-S7> after the 1917 february revolution ousted the tsar and established a provisional government, he returned to russia to play a leading role in the october revolution, in which the bolsheviks overthrew the new regime.