When a storm breaks out in Shanghai, Ren Zixuan returns to the center of the Republic of China's commercial war with an old contract and the city's debt bureaus. Unexpectedly, he and the cold and stubborn Huang Shixi are involved in a life-and-death struggle over mineral rights, docks and military supplies; he wants to settle blood debts, and she wants to keep the family business. The two go from testing each other to fighting side by side, driving the enemy to a dead end in the light and shadow of the sword, and turning each other into the only weakness.
