Huo Tingting, a gym coach with natural supernatural powers, has had the ability to resist beatings far beyond ordinary people since he was a child. He made a living by teaching classes in a gym in a corner of the city in a low-key manner, but because of his bravery, he punched a gold medal fighter in the underground boxing ring. This punch made him targeted by the sinister boxing club owner Shen Wanhao. On the surface, Shen Wanhao is a successful businessman, but he secretly controls underground boxing matches and uses despicable means to harm his opponents. He set a trap, causing Huo Tingting's apprentice to be brutally murdered, and then forced Huo Tingting to enter the ring. Huo Tingting was forced to step into the iron cage, using his fists and flesh and blood to tear apart the darkness of the underground boxing world step by step. Blood, sweat, the sound of broken bones - this is a battle against scales with no retreat.
