confuse about grammar

both are right. '제발' is adverb. In some cases, "나를 잊지 말아요, 제발" is possible.

"제발,나를 잊지 말아요"/"나를 제발 잊지 말아요"/"나를 잊지 말아요, 제발"

All of these are right.

아 여기와서 진짜 한국어 어렵다는거 느끼고 있어요..-_-;;

둘다 맞아요 ㅋㅋ don't forget me please

both are right! ^_^

both are right. You are very good job. :-D