Choi Siwon of idol group Super Junior surprised fans by appearing on stage as a 12m giant at the online Concert. According to SK Telecom on the 1st, Choi Siwon suddenly disappeared from the stage during the performance of the paid online Concert Beyond Love Live! the previous afternoon, and then appeared in a 12-meter-sized 3D Mixed reality (MR) image behind the stage. Choi Siwon, a huge 3D image, waved and talked to members for 30 seconds, and to 120,000 online audiences, "No Challenge? No Change! (It is only if we constantly challenge that we can create a better world.) Choi Siwon's 3D image is produced by SK Telecom's Mixed reality production company Jump Studio, which was launched last monthLove Live!! It is the first case applied to a performance. “Mixed reality content will change the paradigm of entertainment, such as performances, movies and dramas,” said Jeon Jin-soo, head of SK Telecom’s 5GX service division.
Super Junior, also known as SJ or SuJu, is a South Korean boy band formed by Lee Soo-man, the founder of SM Entertainment in 2005. They are also dubbed by the media as the "King of Hallyu Wave" due to their prominent contributions in Korean Wave.
 Wikipedia