Artist Lee Jung-seop was married to a Japanese woman, and they had children together. How was that viewed? Also, how was the rule of law during this period. Say Lee's wife wanted a devorse, would Lee be fairly treated in court?
So to understand this, we'll have to understand how the "normal" Japanese were viewed in Korea.
The Japanese government, like the US government during the 19th century, British crown, and several other colonial powers did with their lands, promoted Korea as extremely arable land, offered acres to people who would settle their and "Japanize" the population. By 1910 about 173k Japanese people inhabited the Korean peninsula- more than in the United States. These people, despite promises of land, wealth, keeping their Japanese citizenship, etc. were often abandoned. The Japanese government wanted people off the island due to it lacking resources- which was the entire reason the Japanese imperial empire began. Many of those who went to Korea, Manchuria, Taiwan, and other Japanese "approved" areas were poor or criminals and not "true Japanese"- which is exactly how the British viewed their white colonial subjects- as not true British gentlemen, and were not cared about. The average ethnic Japanese was not cared for by the Japanese government,the merchants and wealthy business leaders were- but not to the extent they would be if they had succeeded in Japan. Now if the average person intermarried with an ethnic Korean, a couple of things happen. First, it nearly guarantees that the children will not have rights to the land that the original settler(s) were promised. Second, It made the children and partner second-class citizens in a third class colony- and with the only real judges in society being other people, the largest judge would be other ethnic Japanese. Think of how Europeans were viewed if they married Natives/African Americans in the US during the 18th and 19th centuries. Third, on the settlers death, all land, wealth, etc. would be inherited by the Japanese government as opposed to the family (unless there were other ethnic Japanese in which case it would go to them.) The individuals were looked down upon for marrying non-Japanese, but at the same time were looked on with pride for taking pity on the natives, Japanizing them, making them more civil in the sense. They were treated worse than they already were, and their land was taken from them, but it was somewhat encouraged to do so due to it helping eradicate the Korean nationality and identity- which settler-colonialism's goal is.