Kim Jae-joong is a South Korean singer, songwriter, composer, and actor, born on January 26, 1986, in Gongju, South Chungcheong Province, South Korea. Known for his versatile career in music and acting, he holds South Korean nationality and is an Aquarius by zodiac sign. He is active on social media as @bornfreeonekiss and @jj_1986_jj.