Kang Isak, also known as TOAST BOY, is a South Korean rapper born on September 8, 1998, in Nonsan. He made his debut in 2021 with the single "What Happened at the Club (Feat. FEELY)." The track "Kangisak Rhythm," from his first full album TOCANOCO, released on May 18, 2025, entered Melon's Top 500 chart at number 99 on May 21.