My Disobedient Disciple (Book Transmigration)

Blurb:

Shang Qingxue, a straight man from the modern world, has the misfortune of transmigrating into a danmei novel.

System: "Stop the villain from destroying the world!"

Shang Qingxue: "Easy. Why not just kill him while he's still a kid?"

The System's inner thoughts: "...Young man, you have no idea how charming the villain is!"

The great villain Li Lian gazes at him affectionately. "Master, do you really want to kill your disciple? Why don't we cultivate together?"

Shang Qingxue: "Get lost, you pervert!"

The other disciples: "The master and his disciple are showing off their love again!"

Reader's guide:

A short-tempered bottom who transmigrates into a book x a scheming demon king top.

They start out trying to kill each other, then fall in love.

Theme: Sincere love can move heaven and earth.