Their first studio album, Twicetagram, was released in October with the single "Likey", and reissued as Merry & Happy with the single "Heart Shaker" in December.
Album studio perdana mereka, Twicetagram, dirilis pada bulan Oktober dengan singel "Likey", dan dikemas ulang sebagai Merry & Happy dengan singel "Heart Shaker" pada bulan Desember.