C44 Not simple
He had his own methods.
Tong Yan said in disdain. I don't know what kind of method Child Study used.
However, to be able to hide it from the world and Zhao Lili successfully infiltrating Zhao Lili's prison, I think she has her own ways.
If she didn't have any tricks up her sleeve, she definitely wouldn't be able to stay in this prison for so long without being discovered.