On 5 July 2010, Kangin enlisted for his mandatory military service at the Nonsan military camp in Chungcheongnam-do Province, for five weeks of basic training followed by 20 months of active duty with the Republic of Korea Army.
Pada 5 Juli 2010, Kangin mendaftar wajib militer di kemah militer Nonsan, Provinsi Chungcheongnam-do, dan menjalani pelatihan dasar selama 5 minggu dan dilanjutkan 20 bulan penugasan di Tentara Nasional Republik Korea.