...- We expect the capital buffer of Mirae Asset Daewoo Co. Ltd. (MAD) to narrow mainly due to a potential increase in equity investments, higher market risks, and lower profits. - MAD's overall risk management could also be undermined by the weakening credit quality of its corporate lending and investment assets. - We are revising the outlook on MAD to negative from stable. We are affirming our '###' long-term and 'A-2' short-term issuer credit ratings on Korea's largest securities company in terms of assets, and the '###' long-term issue rating on MAD's senior unsecured notes. - The negative outlook reflects our view that we could downgrade MAD if the company's capitalization deteriorates such that its risk-adjusted capital (RAC) ratio declines below 7%, the credit quality of corporate loans and overseas investments deteriorates significantly, or if its funding and liquidity profiles materially weaken over the next 12-24 months....