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은 그저

is just

→ 은
phrase Uncommon #12,672
is just 은 marks the topic, while 그저 means “just” or “merely.” The English translation depends on the rest of the sentence.
KO: 이 책은 그저 시작일 뿐이야.
EN: This book is just the beginning.

톨맨은 그저 그런 팀 이었어요

Tolleman was just an average team.

— 세나: F1의 신화 (2010)

그 순간은 그저 이런 생각 밖에 안 들었다

At that moment, this was all I could think about.

— Oldboy (2003)