@thtgiang Why does it matter if its brain vs courage? Second still has reasons to be in the Kingdom. There's absolutely no point in pissing off the guy at the top of the country. ESPECIALLY when his main goal is to just read the skill books at the palace, where said guy lives.
If he was already done with everything, he would've just told him upfront he doesn't care about his shitty offer.
I would've hoped for a "I don't work for people who are weaker than me", just to see the first prince even more pissed...
But I guess this was the more clever way of refusing.
I'm not rating this 10 out of 10 because it isn't even close to worthy of that, obviously. There are but a handful of manga on this entire site worthy of a 10, and fools who throw around 10s so frivolously make them worthless by doing so.