Chen Yu was not an arrogant person, of course, he was not a low-profile person either.
His lack of arrogance was the result of good upbringing from his parents, and before that incident, before he obtained the "Multiverse Universal Necromancy Spell Compendium," he had no reason to be arrogant—being just an ordinary person.
As for after he began studying necromancy, the myriad spells and formulas were even harder to memorize than the review materials for college entrance exams. Juggling exam preparation and learning necromancy, twenty-four hours in a day were simply not enough. Where would he find the time to be arrogant?
But Chen Yu was not inherently a low-profile individual.