Answer:
He works against the protagonist.
Step-by-step explanation:
An antagonist is a character in literature that stands in the opposition of the protagonist of the story. The protagonist of the story is the main character or the hero of the story and antagonist, in simple terms, a villain.
An antagonist does not necessarily be a person only it could be an institution or a group of people. The word 'antagonist' is derived from the Greek word 'antagonistēs' which means 'rival', 'competitor', or 'opponent.'
As the definition states, the character trait of an antagonist is that he stands in the opposition of the protagonist.