The Masked Guards Could Have Looked Like Boy Scouts
According to director Dong-hyuk, the masked guards were originally going to look like Boy Scouts. Unfortunately, the original uniforms showed too much of the men’s figures. He envisioned the men looking more like a bunch of ants in an ant colony, so he had the uniforms switched to hot pink jumpsuits. He also had them all wear masks to hide their identity, which made their presence more ominous and creepier than the original Boy Scout concept he had in mind.