Oh, do I have A STORY for you.
Once upon a time there was a kpop company named AB entertainment and a Shinsadong Tiger pre deceasement. It was early 2012 and 6 girls were set to debut. On the 15th of February that year, Kang Dami, Jung Yuji, Ahn L.E., Ahn Hani, Na Haeryung, and Park Jeonghwa would walk onto the stage debuting with the single "Holla" and the title track Whoz That Girl. To AB and Tiger's dismay, the debut wasn't a huge success. Not making their situation better, three members, the aforementioned Dami, Yuji, and Haeryung left the company and group as a whole, leaving their lineup split in half. This is terrible for any new group but was basically a death sentence for a company like AB. With their lineup now split in half, AB brought in trainee Seo Hyelin and then vocal coach for the group Huh Solji. After this the group would periodically release single after EP that saw limited success just as much. AB was losing hope. But in late October of 2014, a single that previously failed to chart well earlier that year gained notoriety after a fancam of Hani went viral. It quickly snagged wins on Music Core, Inkigayo, and Music Bank among others. That song was Up & Down, and that group was EXID; now cherished by fans of the early 2010s era of girl groups.