Having accidentally stumbled upon the entrance to the Realm of Nothingness, Qin Liuxi certainly wanted to go in, since the last ingredient required for the Foundation Establishment Pill was located there. If she made a determined effort, perhaps someone would find it for her and offer it willingly.
Therefore, she must enter, and naturally Teng Zhao would follow her, even if the place inside is perilous—he's still just a child?
Children must grow up eventually.
The broader one's experiences, the more knowledge one accumulates. In the face of future storms, one can remain composed, most importantly when these storms have someone beside for protection; but what if one day there's no one to protect him?
He would then lose this opportunity and have to advance on his own, stumbling along the way.
