According to this article , one of FIESTAR member, Hyemi, is most senior trainer in LOEN. She also a member of girl group whose debut date got pushed because LOEN choose to debuting IU first. That girl group eventually disband and it's member become trainee in other agency. Then some trainee join and Hyemi at last debut in FIESTAR this year. I just wonder maybe the reason why IU so intense in promoting FIESTAR (even more intense than LOEN itself) is because she feel responsible for delayed debut of Hyemi and make it up by promoting them hard. I don't have intention to blame anyone for anything, just want to share my opinion. Sorry for bad grammar.