Run! My Sweet Disciple Is Not What He Seems

[Two male leads + cultivation + transmigrate into a book + reborn + System betrayal]

CP: Demon Lord in public, clingy disciple in private, top Chu Xunran × wife-like shizun who doesn't realize it, bottom Ji Huaixu

One dies suddenly and transmigrates; the other takes his own life and is reborn.

After dying suddenly, Ji Huaixu is selected by the System to transmigrate into a book. To avoid meeting the same gruesome death as the original character, he secretly goes against the System's missions. In the end, the System abandons him, leaving him alone in another world.

Before:

Ji Huaixu: “Once a master, a father for life. I don't mind skipping a few generations.”

Chu Xunran: “Neither do I.”

Ji Huaixu: “? You wicked disciple! This is outrageous! You're betraying your master and your ancestors!”

After:

Chu Xunran (smiling): “Shizun, your face is so red. Are you sick?”

Ji Huaixu: “You know perfectly well...”

Chu Xunran (looking utterly aggrieved): “Shizun, don't even think about leaving me again.”

Ji Huaixu (kissing him): “I won't leave you...”

[Major caveat: this is just a writing exercise.]