韓国系移民の息子として生まれたKim Sung Jong 金聖鐘(キム・スンジョン)は、21歳のときに日本国籍を取得
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He was born Kim Sung Jong in 1952 to Korean parents in Osaka. His father was a poor immigrant who built himself a fortune in taxis, property and pachinko, the addictive Japanese version of bagatelle. At 15, Kim Sung Jong was sent to the preparatory school for the private and prestigious Keio University in Tokyo. There he studied politics and law. It was at this time that he underwent surgery on his eyes to make them larger and less oriental, and he took on a new, Japanese name, Seisho Hoshiyama.
When Seisho was 17, his father died in Hong Kong. Seisho shared the vast inheritance with his two brothers and, at the age of 21, underwent another shift of identity, taking on Japanese nationality and the name of Joji Obara.