Gojo Satoru is Yuji Itadori's Sensei first and father figure second. Gojo has been through alot in his life and knows how struggles can be lifechanging for some people... Yuji in this case is a great example for him and also just a great overall friend especially from the other students and he is very glad he came out the Prison realm to be with everyone again... Although recently one of his students he raised Megumi got taken over as a vessel by Sukuna and he is not happy.