A group of people stage a flash mob in Gwanghwamun, Seoul, featuring South Korean singer Psy’s “Gentleman” dance on Thursday. The event was held to celebrate Liberation Day, marking the end of Japan’s 1910-45 colonial rule of the Korean Peninsula. (Yonhap News)

A group of people stage a flash mob in Gwanghwamun, Seoul,on Thursday. The event was held to celebrate Liberation Day, marking the end of Japan’s 1910-45 colonial rule of the Korean Peninsula. (Yonhap News)

A group of people stage a flash mob in Gwanghwamun, Seoul, featuring South Korean singer Psy’s “Gentleman” dance in Seoul on Thursday. The event was held to celebrate Liberation Day, marking the end of Japan’s 1910-45 colonial rule of the Korean Peninsula. (Yonhap News)