Before the war, Lu Xiaoyu had looked for Hao Zhichao and asked him what she could do. Hao Zhichao had wanted to reject Lu Xiaoyu. Although Lu Xiaoyu was stronger than him, the Heavenly Network was not desperate enough to allow a 12 year old to participate in the war.
But he did not expect Lu Xiaoyu to not be grateful. "Lu Shu said that he would help you to fight, so he will fight. Until he returns, I will fight in place of him."
It was as if Lu Xiaoyu and Lu Shu were a whole, who drifted outside the Heavenly Network. But Hao Zhichao understood clearly that even though they said so, they did not treat the Heavenly Network as outsiders.
Hao Zhichao knew about them. These two orphans were on their guard against the rest of the world. But now, these siblings had integrated into the Heavenly Network.