It could be said that the conflict between the cockroach gang and the cat group started before the independent regiment was established. This was a worldwide underground clash which, like the enmity between cultivators and demons and devils, had been ongoing for over a thousand years.
Every beast in the spirit beast circle knew that the cockroach gang and the cat group couldn't exist alongside each other.
For so many years, the cockroach gang had been despised for their gross habits. For example, they liked to live in greasy and unbearably foul-smelling sewers and didn't care one bit for their own hygiene. They contaminated food with their greasy and bacteria-ridden bodies, carrying deadly germs to all corners of the city.