This is the 12134th most frequent Korean word.
눈에만
"Only to the eyes" or "visible only to the eyes."
The word '눈에만' emphasizes that the secrets are specifically visible only to the eye and not to any other senses.
이 화면은 눈에만 보일 수 있는 비밀을 포함하고 있어요.
This screen contains secrets that can only be visible to the eye.
Here, '눈에만' is used to describe that the beauty of the food is limited to its visual aspect.
음식의 모양이 눈에만 아름답고 맛은 별로였어요.
The appearance of the food was only beautiful to the eye, but the taste was not good.
In this sentence, '눈에만' refers metaphorically to something that is only superficially pleasing or attractive to the appearance but lacks deeper qualities.