China go home.
Being familiar with Chinese dynastic history, how could they claim that? Han, Tang and Ming never touched that region. Manchurians may have but they were not Chinese and they eventually conquered China by defeating the Ming Dynasty. During Manchurian rule, Korea acknowledged the Machurians as their protectorate but they always maintained their independence until Japan annexed her in 1911. That same year the Chinese overthrew the Manchu dyanasty and established a short lived American style republic. The borders of the republic never enchroached on the Korean territories referenced.