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Japan originated in Korea, specifically the Baekje Dynasty (百濟 18 BC - 660 AD). The Japanese still call it Kudara, which means "great nation" or "mother country" in Korean (크다 + 나라 = 큰나라). (It is not a Japanese word.) With later massive Chinese migration into the islands, today the Japanese are genetically half Korean and half Chinese.
Japanese people by no means can claim themselves to be a separate race or ethnic group -- whether linguistically or genetically. Korean and Japanese belong to "Altaic" language family (Chinese is "Sino-Tibetan") and contemporary Japanese people's No.1 genetic sequence is Chinese DNA (25.8%) with No.2 being Korean DNA (24.2%) and there is no Japanese DNA whatsoever.
In fact, the first time the Japanese were nationally united in history was only at the end of the 16th century AD(1590), a fact extremely exceptional to East Asian civilization and culture.
The written history of China begins with the Shang Dynasty (商, from 1600 BC to 1100 BC). The origins of Chinese culture, literature and philosophy, developed during the Zhou Dynasty (周, from 1122 BC to 256 BC) that followed the Shang. The feudal Zhou Dynasty eventually broke apart into individual city states, creating the Warring States period (戰國時代, from 403 BC to 221 BC). In 221 BC, Qin Shi Huangdi (秦始皇) united the various warring kingdoms and created the first Chinese empire (秦).
The written history of Korea begins with the founding of Gojoseon (古朝鮮) in 2333 BC. "The Proto-Three Kingdoms" period (原三國時代, from 108 BC to 57 BC) is the time before the rise of "the Three Kingdoms" period (三國時代, from 57 BC until 668 AD) and occurred after the fall of Gojoseon.
After the fall of Gojoseon in 108 BC, Buyeo (夫餘) arose in today's North Korea and southern Manchuria, from about the 2nd century BC to 494 AD. Its remnants were absorbed by Goguryeo (高句麗) in 494, and both Goguryeo and Baekje (百濟), two of the Three Kingdoms of Korea, considered themselves its successor. Shilla Dynasty (新羅) conquered Goguryeo and Baekje, and reunited Koreans in 668 AD.
Japan first appeared in written records in 57 AD in China's Book of Later Han (後漢書): "Formed from more than one hundred tribes, they come and pay tribute frequently."
It is an undisputed fact that the Japanese imperial family was descended from Koreans from the Baekje Dynasty.
For example, the Soga clan (蘇我氏) was one of the most powerful clans in Yamato Japan and played a major role in the spread of Buddhism in that country.
The Soga Clan is of direct Korean descent due to the fact that a Korean clan moved to Japan and became the Soga Clan. For many generations, in the 6th and 7th centuries, the Soga monopolized the position of Great Royal Chieftain (Ō-omi) and was the first of many families to dominate the Imperial House of Japan by influencing the order of succession and government policy.
