It conveys the idea of something lasting for an infinite duration, without end.
Here are some examples of how it can be used:
* Yeongwonhi saranghae. (영원히 사랑해.) - I love you forever.
* Yeongwonhi 기억할 거야. (영원히 기억할 거야.) - I will remember you forever.
* Yeongwonhi 함께하자. (영원히 함께하자.) - Let's be together forever.
It is a powerful word that expresses strong emotions and enduring feelings.