예고편이 · 예고편을
trailer, preview
Example
예고편만 봐도 정말 재미있을 것 같아요.
Just from the trailer, it looks really fun.
Word parts
예 beforehand+고 announce+편 piece
Literally 'advance-notice piece'.
Good to know
On TV, the 예고편 for the next episode plays right after the credits.
Related words