The custom of serving seaweed as an edible materials existed in Japan and the Korean Peninsula, but people in China did not eat seaweed even though they had the custom of eating marine alga, as in Japan and the Korean Peninsula.
ワカメを食用に供する習慣はほぼ日本と朝鮮半島にしかなく、日本や朝鮮半島と同じく海藻を食べる習慣が一応ある中国ですら食べなかった。