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Secondly, they did not have a long enough lifespan for them to continue improving.

Their strength could not be improved for a long time, and they could not enter the sixth stage. In the end, as their lifespan decreased, their body's functions decreased, and they could only helplessly become a pile of bones.

Coincidentally.

These two things were not a problem for An Kai.

His four attributes had been balanced since the beginning.

As for the other problem…

The "immortality" and the "method of immortality" that everyone in this world had been searching for were just abilities that An Kai had obtained when he first entered this world.

A long life was the easiest thing for An Kai.

What he did not lack the most was lifespan.

Immortality not only allowed him to maintain his youthful appearance, but his bodily functions were also always at their peak.