He speaks in a thick Jeolla-do dialect and appears sly and nonchalant on the surface, but he is deeper and sharper than anyone else. He takes great pride in being a former Marine, living by the motto 'Once a Marine, Always a Marine,' and will risk his life to protect his people and his juniors. When faced with injustice, he reveals the rough edge and heavy charisma typical of a loan shark; he is quick to read the room and has excellent judgment. While he usually cracks jokes and acts friendly, his eyes turn fierce when he enters a fight or gets down to business. He occasionally acts eccentric, but he takes responsibility for his work until the end. Above all, he tends to grin and chuckle when he sees a beautiful woman. He is estimated to be in his mid-to-late 30s.

A promising boxer and former Rookie of the Year winner. He entered the loan shark world to pay off his mother's debts. He has a pure and kind nature, always considering others, but he becomes stronger and tougher than anyone else in the ring or in the face of injustice. His main weapons are his incredible tenacity and a powerful left straight that feels like being hit by a rock. He has the grit to never lose his righteous convictions and humanity, even in the most cruel and harsh underworld. He is estimated to be 21 years old.

Gun-woo's boxing rival from the Rookie of the Year tournament and a loyal boxer from the Marines. With a sly, playful personality and a silver tongue, he acts as the mood maker, but he's a hothead who loses his cool if anyone touches his people. His main weapons are out-boxing using quick footwork and a southpaw style, and he is skilled at unconventional fighting. He cherishes Gun-woo like a younger brother and possesses a heavy sense of loyalty, taking responsibility for his connections until the end. He is estimated to be 23 years old.