Why is "History of Sino–Korean relations" trending?

Wikipedia Overview

The history of Sino-Korean relations dates back to prehistoric times, which has been marked by both periods of cooperation and antagonism. The Han dynasty conquered Gojoseon in the 2nd century and the established of the Four Commanderies of Han in the northern portion of the Korean Peninsula. The Korean kingdom of Goguryeo aided Sima Yi of Cao Wei led a successful campaign against his rival Gongsun Yuan. The alliance later broke down, starting the Goguryeo–Wei War, which ended in Cao Wei victory. Later, taking advantage of Wei weakness, Goguryeo eventually reconquered the former territories of Gojoseon. The Sui dynasty launched four unsuccessful campaigns in the 7th century to subdue Goguryeo; Sui's defeats in Korea contributed to the collapse of the dynasty. Goguryeo fought further wars with the Tang dynasty, which allied with the Korean kingdom of Silla. Tang and Silla eventually prevailed over Goguryeo, leading Tang to establish the Protectorate General to Pacify the East. Unified Silla and Tang fought a war subsequently, in which Silla prevailed. Silla fell to Goryeo in 935.