The Participation Party (PPP; Korean: 국민참여당, ) was a political party of South Korea. It was formed by many of the former members of the Uri Party after the death of former President Roh Moo-hyun. Rhyu Si-min was elected as Party Chairman on March 19, 2011. In March 2011 it had 45,335 members.[1] For the April 27 by-elections, the People's Participation Party has cooperated with the Democratic Party to enter Lee Bong-su as the single opposition candidate for the Kimhae seat in the National Assembly of South Korea. On 5 December 2011, it merged into the Unified Progressive Party.