The Gangnam Offensive.
So far, only those who chose to be in the Army and passed the training became soldiers in the Gangnam Armies. To further increase the number of soldiers, requirements for joining the army are no longer so strict. Furthermore, the salary of each soldier is increased by 11.5% .
The Vladivostok military Base, the most modern military base in the Gangnam Republic, is spewing out Jet Bombers at in increased speed: the process of construction of the stealth jets is completely automated, and , with a success chance of over 98% in the preliminary tests, it means that a new jet bomber is ready to strike every day.
Meanwhile, the Government of the Gangnam Republic assigned spies and infiltrators in Japanese China, with the sole job of spreading flyers and posters with " Join the Gangnam Republic!", with information about the minimum wage in the Gangnam Republic ( which is around 700$ ), rewards for helping the Gangnam War effort and even rewards and protection for citizens if they surrender the city without a fight. Also, the posters promote the Chinese government, saying that Japanese China will soon end up in either Chinese or Gangnam hands, which are both better alternatives than Japan, with the main argument being " no slavery!" and flexible work hours.
It must be noted that all current Japanese citizens that join the Gangnam or Chinese state will receive a reward from the Gangnam Republic, and those who will prove their allegiance by aiding in the war effort against Japan will be protected against Japanese expansion as if they were loyal Gangnam citizens. (even if they join China)