I Became Invincible in the Immortal Hero World, Staying in Prison.

Summary

Chen Man Niu and Li Wu You diligently train in a prison, focusing on the "Ancient God Star Refining Technique" and the "Heavenly Sword Classic." During outdoor activities, they encounter formidable criminals, including the "Poison Snake." Initially targeted for abuse, Li Wu You surprises everyone with his strength, defeating the criminals and extracting their martial arts skills. With newfound power, he learns quickly and gains a total of twenty-two martial arts. This unexpected turn of events raises hopes for escape, as Chen Man Niu hints at Li Wu You's potential to rival the prison's strongest.

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