The Villain's White Halo Vol. 03 by Hao Da Yi Juan Wei Sheng Zhi

Former villain Yin Biyue just wants to live in peace in his new world, but all he finds is turmoil. His teacher is off on a suicide mission, Luo Mingchuan is in danger of succumbing to the spirit of the Demon Lord, and the infamous demonic cultivator Rong Zhuo has risen with a massive army to launch attacks across the realm. No one—not Cangya, not the Northern Emperor, nor Yin Biyue’s allies from other sects—is safe with battles looming on every front. How can he and Luo Mingchuan become official partners under these conditions?!

Then, as Yin Biyue and Luo Mingchuan fight side by side against fate, something even worse happens: Yin Biyue starts shedding his mortal emotions. And what good is power if it costs him the love he’s only just found?

The final volume!