Lee Jeonyeok

Born and raised as a slave in the arena, Happy survived by relying on nothing but his monstrous strength. When his master is executed and the arena collapses, Happy is finally freed for the first time in his life. Now, stepping into a world he barely understands, he begins to learn about family, friendship, and society— one painful, awkward step at a time. But the world refuses to let him rest. His identity as a former slave The endless wars against crime The buried secrets of his birth. All of them drag Happy into new battles, each more brutal than the last. Through it all, he grows— beyond a mere fighter, beyond a monster— rising until he stands at the very pinnacle of the world. From the bloodstained sands of the arena to the peak of power, this is the story of the boy who never forgot how to smile.

As life gets harder, Ian pushes his emotions away and resists. His father's violence and debts increase. Thee misfortunes continued and his body became increasingly numb, he accidentally walks in on an illegal fight and receives an offer. "If you get in the game, I will give you all the money on this floor." His survival period begins, where he must survive in an illegal fighting arena.

Gangnam lost his parents from a fire and has turned blind from the incident. He wasn't able to see anything but a hallucination called Kkamjang. Is Kkamjang actually a hallucination or something more? 'Your scars, your two eyes, and… even your strength! I'll change everything for you.'