However, Korea became a colony of Japan by the annexation of Korea, the former emperor family became a "king" family, and his successor became 王世子 (crown prince) (act of making the former Emperor of Korea a king, defining the titles of crown prince, future successors, and their empresses, and treating them with courteous reception).
しかし韓国併合により朝鮮は日本の植民地となり、旧皇帝家は『王』家となり、その跡継ぎは王世子となった（前韓國皇帝ヲ册シテ王ト爲シ皇太子及將來ノ世嗣、太皇帝及各其儷匹ノ稱呼ヲ定メ竝ニ禮遇ノ件）。