South Korea\'s business sentiment for October improved from a month earlier on expectations that the local currency\'s weakness to the U.S. dollar would help boost exports, a poll showed on Tuesday. The monthly business survey index (BSI) for the upcoming month came in at 101.4, compared with 96.3 tallied for September, according to the survey by the Federation of Korean Industries (FKI), the lobbying group of the country\'s large businesses.