This is the 4973rd most frequent Korean word.
글로
"글로" means "through writing" or "in written form."
Here, '글로' is used to indicate the medium (writing) through which thoughts are expressed.
저는 생각을 글로 표현하는 것을 좋아합니다.
I like to express my thoughts in writing.
In this sentence, '글로' specifies the form (writing) in which dreams are preserved.
그는 꿈을 글로 남기고 싶어 했습니다.
He wanted to leave his dreams in writing.
Here, '글로' instructs the method (writing) for providing the answer.