Breakdown of Die klem is op die hoofkarakter.
Questions & Answers about Die klem is op die hoofkarakter.
In this sentence, op means on, just like in English: the emphasis is on the main character.
The expression Die klem is op ... is a normal Afrikaans structure. It works very similarly to English:
- Die klem is op die storie. = The emphasis is on the story.
- Die klem is op detail. = The emphasis is on detail.
So op is the natural preposition used with klem in this kind of sentence.