Ieodo, positioned in the South Sea, is an underwater reef situated southwest of Jeju Island, marking the southernmost reef in Korea. Significantly, Korea's inaugural Ocean Research Station has been established at this site, dedicated to conducting comprehensive marine observations encompassing oceanography, climate, and environmental studies.

The accompanying ink showcases a spectrum of blue tones, characterized by dual shading that adeptly captures the serene landscape surrounding the Ocean Research Station adjacent to Ieodo and the encompassing sea. Notably, the dual shading manifests the tranquility of the South Sea, where the Ocean Research Station is strategically situated, embodied in the green and soft light green hues. While the ink exhibits a slightly brighter tone when employed with a fountain pen, discernible dark shading enhances the overall depth of the writing experience.