Lee Jai-jin is a South Korean singer and songwriter, best known as a member of the popular boy band Sechs Kies. Born on August 21, 1979, he gained fame in the late 1990s when the group debuted, becoming one of the leading figures in the K-pop industry during that era. After the group disbanded in 2000, Lee Jai-jin pursued a solo career and later returned to Sechs Kies when they reunited in 2016. He is recognized for his contributions to music and his influence on the K-pop scene, as well as his engaging personality on various television programs.