Emoticon
In some cases, like ㅎ_ㅎ, the emoticon can mean an emotion even when it is not depicting a face of any specific emotion. Letters ㅎ and ㅋ are widely used in Korean internet as a sign of laughter (similar to the usage of "w" in Japanese Web)for example ㅋㅇㅋ, ㅎㅇㅎ, ㅋㅅㅋ, ㅋ-ㅋ, ㅎ_ㅎ; and so the emoticons using those letters as the eye component can be interpreted as a laughing face.