In July 2013, T-ara performed at the Nippon Budokan to celebrate the release of their second Japanese album "Treasure Box". That album was announced for August 2013. At the concert, it was announced that Qri would be the new leader of T-ara. T-ara later released the music video "Painkiller" as a digital single. The song was made with T-ara, Davichi, See Ya, 5dolls and SPEED. Jiyeon appeared as the main character in the music video. Also in July, Core Contents Media stated that Areum would be leaving the group "towards the beginning of next year".