This study examines the evolution of Korean business groups after the economic crisis. In particular, we investigate the post-crisis changes in their business structure and corporate governance system, which are argued to be major precipitating factors leading to the economic crisis. Our analysis suggests that the divestment intensity of non-core, highly indebted and low intra-group trade firms was higher for groups which survived the economic crisis, compared to the bankrupt groups. Besides, most surviving groups did not pursue diversification as actively as before the crisis, and their financial conditions remained favourable in the post-crisis period. The corporate governance of the groups has also improved in terms of corporate transparency, implementation of monitoring mechanisms and their accountability to shareholders. Therefore, it seems that Korean business groups have successfully implemented radical corporate transformation to adapt to the changed business environment after the crisis. But, the dominance of family management still remains as an important feature of Korean business groups.