National Preceptor, Please Forgive Me. The Truth Is, I'm a Jinx to My Husband

[Bewitching National Preceptor Gong & A Shou Who Thinks He's Human but Is Actually a Little Monster, Substitute Marriage, Lifetimes Together]

I'm practicing writing plot, so this is a little short...

On the night young Lu Jinyi, son of a deputy minister, takes his elder sister's place in the National Preceptor's household, he makes a shocking declaration.

Lu Jinyi, dressed in a bright red wedding gown: "Your Excellency, I don't think we should consummate the marriage. Actually, I'm bad luck for my husbands."

The National Preceptor, also dressed in a bright red wedding gown: "Don't worry, dear. I'm tough enough to survive."

Later, Lu Jinyi learns that the National Preceptor really is tough enough to survive: he is ageless and immortal, waiting for one person in the mortal world.

Thanks to this immortality, Lu Jinyi manages to escape consummating the marriage on their wedding night, but he can't escape being tricked by the king into becoming a hostage and locked in a dark room.

To save him, the National Preceptor flies into a rage and tears down half the palace. He nearly strangles the king, even as heavenly lightning strikes him.

Mo Xuan, his eyes red with bloodlust: "I've already lost him once, and waited through a whole cycle of reincarnation for him. I will never let anyone hurt him again!"