A single gunshot shattered her happiness. Left as the sole survivor after losing her husband and child, she was defiled by a man's lust, hooked on drugs, and groomed into a high-class call girl. Yet, her life took a new turn the day she met a hitman. Mastering the techniques of assassination, she rises up as the ruthless angel—codenamed "SUGAR"—to unleash a roar of vengeance!