Dramatic irony is where the reader or watcher knows something that the character does not.
Plagiarism is taking someone else's work or ideas and passing them off as one's own.
The forms are Direct, Self, Mosaic, Accidental, and paraphrasing plagiarism.
It is such a serious defense because it is a copy of someone else’s work without credit and if you’re faking it as your own, there is big consequences.