Kim alongside groupmate Jung Eun-ji and Jang Hyun-seung, former member of Beast, released the single "A Year Ago" from the project A Cube For Season #White on January 3, 2013 to commemorate the success of their respective groups.
Namjoo bersama dengan anggota lainnya, Jung Eun-ji dan Jang Hyun-seung dari Beast, merilis singel "A Year Ago" dari proyek A Cube For Season #White pada 3 Januari 2013 untuk memperingati keberhasilan grup mereka masing-masing.