By May 09, 2021 On Sunday, May 9, The Korean Brand Research Institute released their girl group brand reputation rankings for the month of May. Want to know who the most popular girl groups in South Korea are right now? Then keep on reading! What are the Brand Reputation Rankings? The brand reputation ranking is an index made through big data brand analysis. The index is used to unearth the consumers' online habits and discover what affects brand consumption. The brand reputation index also measures the positive and negative influence of a girl group, the media's interest in the group, the consumers' interest in the group, and the band's communication volume.