Divine Emissary

Gu Chen was a diplomat stationed on Earth. He was killed by a rocket during a war, but he was accidentally reborn in a parallel world and activated the all-rounded diplomat system.

Weak countries had no diplomacy. Gu Chen used his motherland as a shield, language as a knife, and the countries of the world as a chessboard to compete with the foreign powers!

PS: The introduction is weak, please see the main text.