Tie Kuang, the former boxing coach, was seriously injured when his disciple was beaten to death in the ring. When he was trying to find out the truth, he was plotted against him. At a critical moment, he accidentally awakened the fighting system, able to see through the flaws in all fighting techniques, and continued to become stronger through fighting. From then on, he entered the underground boxing world under the pseudonym "Crazy Beast". In this world full of sin and blood, he swept away powerful enemies from all walks of life, but gradually discovered that his disciple's death was not an accident. Behind it was a huge shady story of underground boxing organizers manipulating matches, seeking wealth and killing people. The angry Tie Kuang decided to use his fists to completely shatter the dark underground order, avenge his disciples, and restore peace to the boxing world.
