This is the 5751st most frequent Korean word.
벽면을
"벽면을" means "the wall surface" in English.
In this sentence, '벽면을' signifies the object of the action, indicating the wall's surface as related to the action of walking along.
나는 벽면을 따라 걷고 있었다.
I was walking along the wall surface.
Here, '벽면을' is being used to specify the wall surface as the object of the verb '칠하다' (to paint).
벽면을 칠할 때에는 균일하게 칠하는 것이 중요합니다.
When painting the wall surface, it is important to apply paint evenly.
In this context, '벽면을' directs focus to the wall surface as the medium used for creative design experimentation.