Most of Korea's east coast is a long straight beach broken occasionally by a river mouth. Hajodae is one of the exceptions: a knuckle of granite pushing into the sea, weathered into slabs and boulders with wind-bent pines growing straight out of the cracks.
The beach itself is modest, maybe a kilometre, and in July and August it fills with families. Out of season it is nearly empty, and the headland is the reason to make the detour — particularly at sunrise, when the sun comes up directly out of the sea beyond the lighthouse.
It pairs well with Naksan twenty minutes south and Seoraksan half an hour inland, and it is a natural stop if you are driving the coast road rather than taking the train.