Oedolgae is a 20-metre volcanic sea stack standing just off Seogwipo's cliffs. The rock itself is photogenic, but the real pleasure is the coastal path around it: black basalt, pine trees, small coves, and long views across the water toward Beomseom.
It sits on the Jeju Olle walking route, so you can treat it as either a quick viewpoint or the start of a longer cliff walk. Sunset is the prettiest time if the sky is clear.