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According to several fan accounts, Hoshi was spotted attending the show on September 2 with some of his group members, proudly waving his light stick and calling out, "Taemin-nim! Taemin hyung!" He also fervently sang along to the songs performed!
Word among Seventeen fans is that Hoshi has been a SHINee World since he was 12 years old. Sounds like he had a great time!