In the midst of her concert tour for Chat-Shire in South Korea, IU also increased promotional activities in Hong Kong, China and Taiwan, hosting fan-meetings and concerts in various cities as well as releasing a compilation album, Smash Hits, to the Taiwanese market on December 11, 2015.
Di tengah tur konsernya untuk Chat-Shire di Korea Selatan, IU juga meningkatkan kegiatan promosi di Hong Kong, Tiongkok dan Taiwan, mengadakan pertemuan penggemar dan konser di berbagai kota sekaligus merilis album kompilasi, Smash Hits, ke pasar Taiwan pada 11 Desember 2015.