Overeagerness Ruins The Growth

While not everyone could take the Underground Holy Spring and digest it, Mo Fan was the exception.

The intense warmth from the Underground Holy Spring attracted many demons to fight for it. Only the guardians of the Underground Holy Spring knew how to keep its energy well-hidden to prevent trouble. 

Mo Fan took the Underground Holy Spring and prevented the spread of its energy. On top of that, he could use the Underground Holy Spring energy to accelerate his growth of cultivation instead of going through a long, arduous cultivation journey.

Did this not show that the Underground Holy Spring belonged to him?

Regardless of whether Mo Fan was a perfect match for the Underground Holy Spring and could absorb the spring energy through his physique, or there was something on him that enabled him to absorb the spring energy and possess the spring, it showed that Mo Fan was the one the guardians of the Underground Holy Spring had been waiting for.