I am J-Rin who didn't even know J in JPA. I am so grateful that Mr. Yeong-Han has easily explained the owner of the association, which is a pointer in the JPA world that was difficult to understand just by reading books, by incorporating his numerous know-hows into the lecture. It is still in the middle of the lecture, but as you said during the lecture, it is a lecture that is worth the money... no, it is more than worth it :) I will finish the remaining lectures well and apply them to my work :)