In fact, Ye Yu was an ordinary girl, at least before she met Luo Ziyu.
In fact, Luo Ziyu's real name is Ziyu, and he is the next heir to the Demon Clan. But he was imprisoned by his father in the space between the human world and the demons until Ye Yu broke in.
Ziyu followed Ye Yu to the modern world, and then established a terrorist organization for Ye Yu, just to protect her.
She was his only sunshine for tens of thousands of years, the salvation of love, and the only elixir that could relieve his lovesickness. He had nowhere to escape.
Even if the entire demon clan fights against him, he will still protect her, pamper her, and love her.