Seoul: In a significant historical event, President Park Chung-hee declared martial law across South Korea and dissolved the National Assembly in 1972. The following month, the government introduced the Yushin (Revitalizing Reform) Constitution, which significantly expanded presidential powers and allowed Park to remain in office indefinitely. Park remained in power until his assassination in 1979.

According to Yonhap News Agency, another tragic incident occurred in 1974 when a devastating fire swept through a hotel in downtown Seoul, resulting in the deaths of 19 people. In 1978, South Korea discovered an underground tunnel near the inter-Korean border village of Panmunjom, dug by North Korea as part of its efforts to prepare for an invasion of the South. This marked the third such tunnel found in South Korea.

In 1985, a secret meeting took place between South Korean officials Chang Sae-dong and Park Chul-un with North Korean leader Kim Il-sung to propose a South-North summit. However, the meeting failed to yield any agreement. In a diplomatic development in 1991, South Korea established formal relations with Estonia.

In sports, 1999 witnessed Choi Yo-sam winning the WBC light flyweight championship. In 2007, the South Korean government earmarked 1.5 billion won (US$1.2 million) to assist hundreds of ethnic Koreans in Japan facing eviction to purchase disputed land in their community. This action was linked to the long-standing Utoro case, one of Japan's most prolonged legal disputes.

In a legal matter in 2012, Park Young-joon, a former vice economy minister and close aide to former President Lee Myung-bak, received a two-year prison sentence. The Seoul Central District Court found him guilty of ordering illegal surveillance on public servants and taking bribes related to a massive construction deal in 2008.