1. K is a pseudonym of Russian and currently London-based singer Ekaterina Kishchuk (born in Tula, Russia, 13 December 1993), better known as KATERINA and ex-member of a successful Russian girl group SEREBRO. Reborn as K in her newest solo project she combines electronic experimental sound and intense beat with soft and tender vocals. 2. K (pronounced Kei; real name Kang Yoon-sung) is a Korean singer. After his Korean debut with the song "Good-Bye" in the Korean drama Sunshine Pours Read more on Last.fm