How Can I, an Immortal, Practice with Demons?

He is the banished immortal with the highest cultivation level and the best monument in the heaven. The emperor personally gave him the immortal title Ronghai Xianjun. He has a jade-like face, an ethereal figure, and three thousand white hair. He is the lowest level little demon in the world. He has nothing, strange appearance, smart and lively, naughty and sensitive. The two of them met because of a catastrophe when they were immortals and descended from the mortal world. The cold, elegant and upright immortal disciple met the little demon who behaved as he pleased. From the initial dislike to the later love, let's see how they performed a splendid song of the Three Realms. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.