2019 K-World Festa (2019 K-WORLD FESTA) closing performance Photo Wall event was held at the Olympic Park Gymnastics Stadium in Seoul Songpa District on August 24th.
Super Junior Choi Choi Siwon attended the ceremony.
Jung Yu-jin
About Choi Siwon
Choi Si-won, known mononymously as Siwon, is a South Korean singer, songwriter, model, and actor known for his work as a member of South Korean boy group Super Junior.
 Wikipedia