No One in the Sect Knows the Senior Sister Is a Spy

[No romance, feel-good power fantasy]

After failing her tribulation, Meng Qingli becomes a princess destined for sacrifice, but unexpectedly wins the favor of the Demon Lord, who takes her into the depths of the Demon Realm. Thanks to her extraordinary talent, she quickly rises to prominence in the Demon Realm over the course of a mere hundred years, becoming the center of everyone's attention.

Now entrusted with an important mission by the Demon Lord, Meng Qingli disguises herself as a sect's senior sister and infiltrates Tianyan Sect.

Bearing a secret mission, she enters a sacred land of cultivation and uses her extraordinary abilities to plan her every move amid treachery and intrigue.

P.S. Someone has one-sided feelings for the female lead.