The correct answer to this open question is the following.
Some of the benefits and disadvantages of proxy wars on the local populations of Korea were that those armed conflicts affected the people of Korea, confronted and dived them creating a scar so deep to heal, and caused much destruction in the Korean territory.
A proxy war means that two nations or factions fight each other to defend the interests of other nations that did not directly participate in the war. That was the case of the Korean War during the Cold War years, in which the Soviet Union wanted to spread Communism and supported North Korea, and the United States wanted to stop Communism and supported South Korea.