Sōshi-kaimei was a policy of pressuring Koreans under Japanese rule to adopt Japanese names and identify as such. The primary reason for the policy was to forcibly assimilate Koreans, as was done with the Ainu and the Ryukyuans. The Sōshi-kaimei has been deemed by historians as one of the many aspects of cultural genocide that the Japanese attempted to impose on their non-Japanese territories.
Announcement of the Sōshi-kaimei policy issued by the Taikyu court, written bilingually in Japanese and Korean, in a special parallel style in which hanja/kanji were printed only once and were "shared" by the hangul and kana texts
Korea under Japanese rule
From 1910 to 1945, Korea was ruled as a part of the Empire of Japan under the name Chōsen (朝鮮), the Japanese reading of Joseon.
Japanese marines landing from the Unyo at Yeongjong Island which is near Ganghwa
Battle of Namdaemun in 1907 - Le Petit Journal
General power of attorney to Lee Wan-yong sealed and signed, by the last emperor, Sunjong (李坧) on 22 August 1910 (융희4년; 隆熙4年)
Terauchi Masatake, the first Governor-General