CAIRO, Jan 19 (Reuters) - South Korea expects to sign a memorandum of understanding for a $1 billion soft loan to Egypt during a visit by President Moon Jae-in, the Korean ambassador in Cairo said on Wednesday. The loan would be for five years, with exact terms still to be confirmed, Ambassador Hong Jin-wook told Reuters. Moon is due to meet Egyptian President Abdel Fattah el-Sisi on Thursday.