Known to his fans as K, this South Korean pop singer is perhaps most famous for his Japanese-language album Beyond the Sea, which rose to number two on the J-pop music chart in 2006. His most popular singles from the album include "Over..." and "Only Human."
He released his debut Korean album -- the self-titled K -- in April of 2004 and followed it up with a Korean-language recording titled Beautiful Smile.
In 2010, he temporarily halted his music career to carry out his compulsory South Korean military service.
He was born and raised in Goyang, South Korea. In 2014, he married Japanese television personality Mari Sekine.
He is a contemporary of fellow South Korean-born pop singer Lee Joon.