[1] In a narrow sense, luk khrueng means people of mixed Thai and foreign origin;[2][3] a person of mixed Thai and Chinese origin is called tai chuea sai jin, rather than luk khrueng.
While some of the servicemen formed lasting relationships with Thai women, some luk khrueng were the product of temporary relationships with "rented wives" or sex workers, a fact that led to some discrimination in that era.
Some Thais were also hostile because of the perceived lack of racial purity but most were quite accepting.
[4] In the modern era, many luk khrueng are born of relationships and marriages when Westerners come to live and to work in Thailand or when Thai people go to study in Western or foreign countries.
[5] In more recent generations, luk khrueng have become accepted and even embraced by society and many luk khrueng have carved out a prominent role in the entertainment industry in which their often-fluent English and their Caucasian features (such as fair skin, larger or colored eyes and allegedly tall physique), which are deemed attractive in Thai culture, have proved to be advantageous.