Bradycardia refers to a resting heart rate that is slower than usual. A heart rate of fewer than 60 beats per minute (bpm) may indicate an underlying health issue, but this is not always the case.

Even before his official debut, Changsub showcased his talent with songs like “At the End” for BTOB's solo project Piece of BTOB and his Japanese solo album "BPM 82.5". As a member of BTOB (Born to ...