Short answers, pulled from the story.
Seoul Plaza reopened on the 1st of May 2004 following a significant renovation project. The Seoul Metropolitan Government led this initiative to replace an old traffic square with a public space for citizens.
The plaza covers 3,995 pyeong or 13,207 square meters in total area. Grass occupies 1,904 pyeong or 6,294 square meters within the elliptical shape.
Demonstrations against US beef imports took place at Seoul Plaza in South Korea. The site serves as a central point for civic expression and political discourse where large crowds gather to voice opinions on national issues.
Every winter since 2004 the plaza hosts an outdoor ice rink from mid-December until February. Skaters glide over the temporary surface before it is replaced by green lawn again when the fountain becomes operational once more after the ice melts away each year.
As of the 1st of June 2011 the plaza became a designated smoke-free zone. The Seoul Metropolitan Government enforces fines against smokers who violate this policy to ensure clean air and safety for all people using the public square.