The only S-class fire ability user on Earth, Lin Yu, was reborn in the Tianhuo Continent, a world where fire is revered, into the body of a fifteen-year-old boy named Xiao Yu.

The original owner of this body had been severely injured while saving a girl named Wang Yan from a ferocious beast, leaving him on the brink of death. As memories flooded his mind, Xiao Yu gradually came to understand his new identity and the important people around him—his elder sister Liu Qing. Liu Qing was strong-willed and had shouldered family responsibilities from a young age. Xiao Yu resolved to cherish this familial bond. However, Xiao Yu also discovered that while he had inherited fire abilities, his weak constitution caused the flames to be feeble and the power to be unimpressive.

Xiao Yu decided to practice the "Muscle-Tendon Change Classic", a scripture obtained from a high monk on Earth, to enhance his physique and increase his affinity with fire elements. He realized that in a world where strength is esteemed, only by becoming powerful could he protect himself and his loved ones and achieve his aspirations...

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"Boom!..."
The fierce attack of the Saint Lord of Burning Heaven heavily smashed onto the space that almost solidified, causing even his own figure to tremble.