Although they were formerly enemies, the Tang accepted officials and generals of Goguryeo into their administration and military, such as the brothers Yeon Namsaeng (634–679) and Yeon Namsan (639–701).
Meskipun sebelumnya saling bermusuhan, Tang menerima masuk pejabat dan jenderal Goguryeo ke dalam pemerintahan dan militer Tang, seperti dua bersaudara Yeon Namsaeng (634–679) dan Yeon Namsan (639–701).