After losing his parents, the young man Jun lived a peaceful life alongside his two siblings. Though quick-tempered, he was bright and well-loved by his friends. But one fateful night, everything changed. His older brother was murdered by men from the Underworld, his home was reduced to ashes, and his younger sister was kidnapped. Barely escaping with his life, Jun was confronted with a devastating truth: “This is revenge against your family.” Stripped of everything, armed with nothing but his bare fists and burning resolve, Jun vowed to take his revenge. Yet as he set out on his lonely path, another avenger crossed his way… A gripping crime thriller where vengeance only breeds more vengeance.