異

Likely an ideographic pictograph.

Composed of 田 (“field”) and 共 (“together”), but traditionally interpreted as depicting a person wearing a ghostly mask with both arms raised.

This suggests the sense of unusual or other.

이상 (異常) – abnormality, unusualness

이국 (異國) – foreign country

이인 (異人) – unusual or extraordinary person

이질 (異質) – heterogeneity, difference in nature