Love between fairy & devil. book 1, Cang Lan Jue.

"The novels that inspired the hit Chinese live-action drama on Netflix! A powerful demon lord finds his life linked to a seemingly weak fairy in this epic fantasy romance. Weakened after an epic battle, the demon tribe has finally managed to resurrect Dongfang Qingcang, the powerful ancient demon lord. Ready for his great power to help them take over the heavenly realm, their plans are suddenly put on hold when they realize one terrifying problem...