Sadaejuui

Sadaejuui (lit. "serving-the-Great ideology"; Hangul: 사대주의, Hanja: 事大主義, ) is a largely pejorative Korean term which evolved in the mid-20th century from a more widely used historical concept.
The contemporary term "sadaejuui" was derived from the Chinese "shi da" (Korean, "sadae") as used by the philosopher, Mencius.
In other words, "sadaejuui" is a compound-word composed of "sadae" + "juui."
Etymology.
The term "sadaejuui" was invented by early 20th century Korean nationalists. The antecedents of this modern term is the historic term "sadae" (), which comes from the word in Mencius's () book, which means "service to the great by the small" or "a small kingdom accommodates a large."
 
Overview.
"Sadaejuui" conflates an attitude of subservience with the political realism which accompanies the prudent recognition of greater power. "Sadae" describes a foreign policy characterized by the various ways a weaker nation-state such as Korea acknowledges the strength of a greater power such as China. "Sadae" is made manifest in the actions of the weaker nation-state as it conveys goodwill and respect through its envoys.
The utility of the "sadae" concept in Korea was recognized from the period of Three Kingdoms of Korea to 1897; and it is demonstrated in the relationship of mid-Joseon Korea towards the Ming dynasty of China. Joseon made every effort to maintain a friendly relationship with Beijing for reasons having to do with both realpolitik and an idealized Confucian worldview in which China is perceived as the center of a Confucian moral universe.
The kingdom of Joseon accepted its place in a Sinocentristic world order. The Joseon foreign policy was organized around maintaining stable Joseon–Chinese relations in the period from 1392 through 1910. It contrasts with limited trade relationships or "kyorin" diplomacy (교린정책/交隣政策; "lit." "neighborly relations") in regard to Joseon-Japanese relations in this period.
The concept of "sadaejuui" was central in the writings of polemicist Shin Chaeho. His ideas and voice became prominent features of Korean nationalism. Sin is known for having argued that the "sadaejuui" inherent in Confucian historiography served 
His revisionist writings sought to deny the relevance of "sadae" as an important element of Korean history.