Julius was not so dense as to miss the polite refusal in his companion’s words.
As for the "full support" Shen Xuan had mentioned, Julius did not put much stock in it. While Shen Xuan’s potential as the top student in the Swordsmanship Department was indeed remarkable, his current strength was not enough to assist a Prince.
His efforts to recruit him now were driven more by an interest in Shen Xuan’s future potential.
Chapter 217