SE7EN was an instant smash upon debuting in 2003. With his good looks and passionate tenor voice, he emerged as a rival to the other major Korean R&B sensation of the time, Rain. (They're actually old friends.) SE7EN's songs—which often feature guest spots from other artists nurtured by the YG Entertainment management company—offer an urban take on the usual electro-pop and ballads, marked by multi-tracked harmonies and a cool, laid-back vibe.