Foreign relations of South Korea
On January 18, 1952 The first president of South Korea Syngman Rhee declared that the vicinity of Dokdo was a territory of South Korea (Syngman Rhee line). Subsequently, some 3,000 Japanese fishermen who conducted fishery operations in this vicinity were captured. This incident, called the Dai Ichi Daihoumaru Ship case strained relations between South Korea and Japan.
1987 South Korean presidential election
Nearly a month later on 10 June, mass protests broke out as Roh Tae Woo was announced successor to the presidency as the then chair of the DJP. The public nature of the announcement and the death of a university student who was tortured by the police triggered protests across Korea. In the following weeks, multiple protests were held, and on 29 June, the DJP candidate Roh Tae Woo capitulated to demands for constitutional amendments, proposing an eight-point plan"." It included the following concessions:
The new constitutional amendment was ratified by the National Assembly on 12 October, and was submitted to a referendum to the South Korean public on 27 October. 93% of voters cast ballots in favor of the amendment, which permitted the direct, democratic election of the 6th President of South Korea.