Urban Fantasy: An Ancient Demon King Is Sealed Inside Me

Modern Urban High Martial Arts + One Female Lead + No System + Not a Power Fantasy + Taoist Talisman Master + Ensemble Cast. Readers who dislike the premise, please stay away.

For more than ten years, someone has kept calling out to me, asking me to find her.

I never expected her to be a demon king sealed inside my body.

I thought she wanted me to set her free,

but she said she wanted to give me power.

What is she plotting? Should I accept her power?