Yeon Namsaeng (연남생, 淵男生) (634–679) was the eldest son of the Goguryeo Dae Mangniji (대막리지, 大莫離支) Yeon Gaesomun (603?-665). In 665, Yeon Namsaeng succeeded his father and became the 2nd Dae Magniji of Goguryeo.
Read more about Yeon Namsaeng: Dae Magniji, Fall of Goguryeo and Death