Summarize the reasons why Zhou Jun thinks that Qin will be reactive.

To sum up, Zhou Jun thinks that Qin will fail because Hanyi Yangcheng is a big city with a large scale and a large population. It can eat food for several years, and it has the help of South Korea and Chu, so Qin Jun can't do anything about it. According to relevant public information, this sentence came from the attack of Yiyang in the Eastern Zhou Dynasty. Zhou Jun analyzed the strength of Yiyang, South Korea, the strong city defense, and Chu sent troops to rescue. In Bali, Fiona Fang, Yiyang City, there are 100,000 soldiers in the city, and the grain reserve is enough for several years. South Korean Prime Minister Gong Zhong has 200,000 troops. Once the war breaks out, Cui Jing, the general of Chu State, will lead troops to rescue Yiyang City, plus Han and Chu.