Previously, Gu Shanhai planned to wipe them out, but when he discovered that these Ghost Hunters were reduced to ashes and burdened with the task of searching for fuel, he abandoned the idea.
In this situation, the fuel is likely being supplied to either the Dual-star or one of them.
He isn't sure what would happen to the world cluster if the Dual-star Celestial Body ran out of fuel. He isn't a civilization from the Wizard World, so he naturally doesn't know how to solve the Dual-star issue, nor did he plan to solve it. It's too difficult, involving an entire world cluster.
More importantly, he doesn't know exactly how many worlds are contained within this world cluster, and any careless action could potentially drag himself into trouble.
Save the world? Better to take care of himself.
When poor, cultivate oneself; when wealthy, help the world.
Right now, he's still poor, so it's best to cultivate himself without any necessity to assist the world.
