South Korea\'s prosecution has beefed up its investigation team to speed up the repatriation from Canada of a key lobbyist for a troubled local savings bank to probe his role in a massive influence-peddling scandal, officials said Saturday. Park Tae-gyu, 71, is suspected of helping corruption-ridden Busan Savings Bank lobby senior officials and politicians so that the lender could avoid a suspension of operations, officials at the Supreme Prosecutors\' Office said.