The reason Qin Jun was so ignorant and lawless was mainly due to the Qian Emperor's excessive favoritism, for among all the princes, Qin Jun was the one who resembled him the most.
That was also why the Qian Emperor arranged a marriage contract between him and Nan Yuxin, but as Qin Jun grew up, he became more decadent, causing the Qian Emperor's fondness for him to gradually decrease. Qin Jun's banishment had been orchestrated by Qin Yu, not only for the sake of Nan Yuxin, but also to hide the jealousy in his heart.
No matter how outstanding his achievements were, he always felt like the Qian Emperor's affection for him was less than that for Qin Jun.
Embezzling the royal treasury was a crime that implicated nine clans, and even the Qian Emperor's affection for Qin Jun couldn't overlook such a deed, hence, in a fit of anger, he banished him to the borderlands.