IUŌĆÖs two-day solo concert titled The Golden Hour: Under the Orange Sun was held on September 17th and 18th with over 80,000 people in attendance. On the 19th, Moon Lovers: Scarlet Heart Rye star Lee Joon Gi took to social media to post several pictures. One photo showed himself standing back to back with the singer, while the other photo featured him holding IUŌĆÖs light stick in front of the concert hall. On the same day, Kang Han Na also shared a picture of herself with IU on her social media. BrokerŌĆśs Lee Joo Young also shared a photo of herself with IU on her Instagram story. Moreover, on the 17th, Kim Soo Hyun posted an Instagram Story of Seoul Olympic Stadium where IUŌĆÖs concert was held. There, he shared a glimpse of a large banner of the singer hanging outside the hall. TOMORROW x TOGETHERŌĆÖs Subin took to Weverse to express how amazing the event was by writing ŌĆ£My whole body aches from screaming and shaking my arms like an orangutan at the concert. While I was at it, I imagined myself singing a duet with IU. I think I was in heaven for a couple of hours or so.ŌĆØ On the same day, Jungkook was sighted at the concert with a black hat and mask on. Reports say that he was spotted on the first and second day of the event with J-Hope. Source (1, 2, 3)