https://www.chuing.net/zboard/zboard.php?id=mvs&page=1&db_sel=&r_type=&num=&divpage=23&best=&sn=on&ss=on&sc=on&keyword=%EC%BD%94%ED%98%B8%EB%AA%B0%EB%A1%9C%EC%A7%80&select_arrange=headnum&desc=asc&no=120760 질문해놓고 강의 시작해버리노 ;