South Korea's listed companies saw their ability to repay short-term liabilities improve slightly in the first half of the year on reduced short-term debts, data showed Monday. The average current ratio of 469 of 660 listed firms, which are listed on the Seoul main bourse and close their books on Dec. 31, reached 239.48 percent as of end-June, up 6.13 percentage points from the end of last year, according to the data by the Korea Exchange and the Korea Listed Companies Association.