The God of War's Secret Supplier

Zia, burdened with debt, discovers an old iron bucket connects to the ancient frontier. Lord Kian is in dire straits. Zia's supplies solve the army's needs. They exchange goods via the bucket. Zia helps the frontier with modern supplies, and Kian repays her with treasures to solve her troubles. Frontier peaceful, but they cannot meet due to time and space barrier. Later, reincarnated, they meet again, continuing their destiny.