On September 29, 1971, the completion ceremony of 5.16 Square was held in Yeouido.
The plaza was completed seven months after its construction began, and was able to accommodate 550,000 people at the same time with a 120,000-pyeong scale.
The name was changed to 'Yeouido Plaza' and the park was established in 1997.
In 1999, it was opened as a "Yeouido Park" with ecological forests and lawns.