The song "4 Walls" by f(x) touches on the idea of love being like a mysterious maze - a concept that is often explored in their music. The lyrics describe how emotions are fleeting and perfect beginnings don't always last, with the narrator feeling lost in a confusing and mysterious situation. The "four walls" represent the confinement and limitations that come with love and being in a relationship. The mirror being filled with the person they love represents how the object of affection is all they need to be content. The pre-chorus emphasizes the narrator's fascination and intrigue with their love interest, enjoying their presence even as they feel overpowered by them. The chorus repeats the refrain "love is four walls" as a reminder of the restrictions placed on them by their love. The bridge shows a desire to escape the confines of conventional love stories and have a "fantasy" with their partner. The song ends with a plea for their love interest to reveal more of themselves to the narrator, as they are entranced by their mysterious and beautiful qualities.
—SongTell