Indeed, a gap of nine full levels is like a chasm for ordinary players. Being trapped in such an environment, they are basically left at the mercy of others.
Unfortunately, he, Mu You, is not an ordinary player, but a Sorcerer. He also has Vampire skin, which significantly changes his attributes between day and night. Regrettably for his enemy, they had chosen to imprison him deep in the night, when his power was nearing its peak...
Presently, Mu You's basic attributes are 13 points of strength, 26 points of agility, 39 points of intelligence, 17 points of constitution. With the bonus from the Vampire skin doubling all his attributes, aside from intelligence, he surpasses his opponent in everything else!
So, in terms of attributes alone, Mu You is not at a disadvantage, but actually holds the upper hand.