Moon Jae-in is being sworn in as the new president in a brief ceremony at the National Assembly at noon Wednesday and immediately starts work.

New presidents normally have an orderly 60-day transition period between administrations as they put together their Cabinet and staff, but Moon is denied that luxury because his predecessor Park Geun-hye was ousted over a massive corruption scandal in April.

Moon hopes to appoint his chief of staff and top security adviser on Wednesday and will announce his nominees for prime minister this week as he swiftly plugs the power vacuum that has plagued Korea since October.

He is scheduled to speak over the telephone with the leaders of the U.S., China, Japan and Russia.