은 완전히

is completely

→ 은
phrase Rare #13,673
is completely 은 is a topic particle attached to the preceding noun or phrase, while 완전히 means “completely.” The exact English translation depends on the sentence and may simply be “completely.”
KO: 지금은 완전히 다른 느낌이야.
EN: Right now, it feels completely different.

빌딩은 완전히 포위됐다

This building is completely surrounded.

— 롤라 런 (1998)