Heaven-Defying Martial God, Do You Call This a Child from a Poor Family?

Traveling through ancient times, Qin Yun obtained the God of War system. You can obtain the body of an overlord, you can understand Guigu's Art of War, you can learn the Sun family's art of war... Turning your hands into clouds, turning your hands into rain, it's all a matter of course! But Qin Yun sadly discovered that the system must be activated! The activation condition is to marry a princess-level beauty! As a country man, Qin Yun cried out in despair. It wasn't until he was inexplicably recruited by the Duke as his son-in-law that Qin Yun finally activated the system. I thought that from now on, I would be able to live a peaceful life and have a beautiful princess at my fingertips. But as his understanding deepened, Qin Yun realized that he was just a chess piece! Qin Yun: I just wanted to be a son-in-law, but you forced me to become a martial god and set the chessboard on fire!