since the drama went different way with the webnovel, I think it'll be fun to speculate on what happened (or is going to happen next). Please share if you have any!

Here's my guess on what happened at Lishan. :

i remember at Yeli's flashback scene, she was running to Lishan's gate before being captured. but the people who captured her also wear Lishan academy uniform... also they all wear a mask! my theory is that Yeli alone survived a small plague in Lishan mountain. Maybe some kind of virus carried by the monkeys? Being left alone and also seeing so much death, no wonder she went crazy.

i would go extra mile with theorizing that the one who spread the disease maybe one of the royalty?