Businessman Su Wan encounters the giant swamp dragon Mo Lin and exchanges the strange "ambergris" for human anti-rust metal to fight against the iron worm plague. She founded the "Scale Iron Trade" and established a strict "equivalent exchange" system: one gram of incense is exchanged for one kilogram of titanium gold, and those who violate the contract will suffer repercussions! However, during transportation, "element pirates" frequently attacked the anti-corrosion barrier. Su Wan and Mo Lin teamed up to set up an ambush, using dragon breath to trap the enemy and iron nets to capture the thieves. From fussy trade to an alliance to protect swamps and control pollution, Mo Lin whispered: "Fairness is the foundation of trade." This is a test of integrity that transcends species.
