Where I understand you both, Duke also had a time advantage to build himself stronger. He had plenty of resources etc whereas Jiwoo did not, even though he may have amazing mentors he also puts in a ton of work and amazes them with his own growth an that's due to the work he put in, lets not diminish that. (=・ω・=)
He had teachers, was from a wealthy known family etc... He also came from a top tier school that taught him as well. His problem isn't he didn't have teachers, he lacks self control and suffers from a god complex that's paired with insecurities from a student (Jiwoo) that surpased him even though he was considered one of the strongest. His issues are hard to "correct" or replace with something healthier unfortunately. (=・ω・=)
Am I the only one who felt so bad about duke? Coz unlike jiwoo he doesn't have reliable adults around him