After topping streaming and album charts with Purpose, Girls' Generation's Taeyeon celebrated the success of the release with SONE at the SK Olympic Handball Gymnasium in January 2020. Despite the postponement of the rest of the tour, fans can still recall all the touching moments of the vocalist's dazzling The UNSEEN concert through this video set, which includes performances of all her solo hits and even the Frozen II OST song Into the Unknown, as well as rehearsals and behind-the-scenes footage.