Since the master hid the books underground, they must not want anyone to find them; it'd be better not to tell Xiang Yimo.
Just like the Hundred Spirits Pill was left for someone fated to find it, if Xiang Yimo and the Underground Library were truly destined for each other, he would naturally discover it one day without her having to tell him!
But Zhong Lingling still couldn't figure out who built that Underground Library in the first place!
Being of limited knowledge and not schooled in medicine, she couldn't begin to evaluate the value of the books below.
She only knew that the bottle of Hundred Spirits Pill in her hand must be extraordinary; she wouldn't use it for common illnesses. If in the future her friends and family encountered ailments similar to Xiang Yimo's incurable disease, she would contribute it then.