Goryeo made the policy to win the favor of people and maintained good relationship with Silla. As a result, Silla surrendered unconditionally to Goryeo. Meanwhile, Later Baekje collapsed by itself as princes fought each other over uccession to the throne. Because of the internal conflict, Later Baekje became weaker and weaker and was conquered by Goryeo. Finally, Goryeo united the Later Three Kingdoms again (936) and accomplished re-unification of Korean people. 