So the typical, "Everyone looks down on me because I didn't come out of the gate overpowered, but fail to realize my skill makes me invincible." A good trope, but in this context?
And the deal of, "raise 10 orphans..." is such a bullshit, one-sided deal. To raise someone is to care for them in till they are deemed 'adult'. Which, even if you're lucky, is still a good few years. The king is either hoping he'll fail and die or just complete his task (most orphans are small children) and die from old age.