Singer, songwriter and producer Kim Hyung-soo blends mellow R&B tones and a cherubic pop sensibility. He has collaborated with rappers like J. Han for the jazzy, lovelorn interlude "Madeleine" while deploying English and Korean language. For "Another Paper", a acoustic ballad from his solo album Paper, he and his younger sister Lovey deliver an achingly emotional plea for patience and understanding. Whether dipping into jazzy hip-hop or urban pop, Brother Su emphasizes soothing candied vocals and bubbly melodies with restraint and grace.