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South Korean Prime Minister Chung Un-chan offers his resignation at the Government House in Seoul, on Thursday. Image Credit: AP

Seoul: South Korea's prime minister offered to resign Thursday after parliament shot down his efforts to scrap a plan that would relocate several government ministries out of the capital.

Chung Un-chan, an academic who was appointed in September, has led the charge to abandon the project, thought up by the previous liberal administration.

President Lee Myung-bak has said the plan to move more than half of the 15 government ministries from Seoul and a nearby city would waste taxpayer money and create inefficiencies.

The National Assembly, however, voted down Lee's push late last month, forcing him to start work on implementing the original plan that proponents say would help foster regional development and resolve Seoul's worsening traffic and housing problems.

Chung's resignation move came as a surprise since the ruling Grand National Party won Wednesday's parliamentary by-elections, which were seen as a referendum on public support for Lee.

The post of prime minister is largely ceremonial with little decision-making power, but the person holding the position leads the country if the president becomes incapacitated.

Under the relocation plan, Seoul will remain the capital city and retain the presidential Blue House, the Defence Ministry and the Foreign Ministry, among others. But other ministries, including some located in Gwacheon, a city near Seoul, would move to a site about 160 kilometres to the south.

Guilty conscience

Chung told a nationally televised news conference that he had "a guilty conscience for failing to prevent a waste of national strength and national confusion" that the relocation would cause.

It was not immediately known if President Lee would accept his resignation. But Chung said he would continue his duties as the prime minister until Lee appoints his successor.

Lee has said he would reshuffle his Cabinet after the parliamentary by-elections but didn't say if he would replace Chung, too.