An Extra Decides to Practice Dual-Cultivation Techniques

[Not sure whether this is one-on-one or has multiple male leads, so please be cautious about bookmarking.]

[If it's one-on-one, it's probably a sneakily leveling-up, snarky protagonist x a workaholic demon lord.]

I will never forget that day.

That day, my kind and timid adopted brother suddenly went berserk. Grinning cruelly, he slaughtered everyone who had bullied him, sending blood spraying everywhere.

Xiao Bai from next door, who could barely read, suddenly became unusually solemn. “Today, I shall uphold justice and slay you, evil fiend, in the name of Heaven!”

The little blind boy who often helped me feed the geese suddenly opened his eyes. His golden pupils gleamed, and with a “whoosh,” he turned into a sword.

Meanwhile, holding a goose and leading a dog, I watched my home of more than ten years crumble amid flashing blades and swordlight, utterly at a loss.

“...” Seriously, who are all these weirdos?

I didn't recover my memories until I was captured and taken to the Demon Realm.

It turned out I had transmigrated into a novel as a nobody, and the people around me were all either villains or protagonists.

As a nobody, if you're lucky, you're a background prop. If you're unlucky, you're the poor soul trampled by the protagonist's crew and the villains in turn.

That's what I always thought.

Until one day, I found a book with four glittering golden characters on the cover:

The Dual Cultivation Manual

I remembered that after my adopted brother revealed his identity as the Demon Realm's Grand Protector, he had once smiled and said to me, “You have poor spiritual roots, so you can't become an immortal. You aren't ruthless enough to become a demon, either. This is all your life can be.”

Xiao Bai from next door, who called himself a Dao Lord, had also stated with certainty, “There is no cultivation method in this world that you can practice. We belong to different worlds, immortal and mortal, so our past affection means nothing.”

Determined to prove them wrong, I opened the book and set my sights on the Demon Lord of the Demon Domain, my adopted brother's superior and Xiao Bai's sworn enemy.

I thought I could deliver a satisfying face-slapping to the heroes and villains alike. But when they learned I could cultivate, they both focused on exactly the same thing:

“The Dual Cultivation Manual... I suppose I should congratulate you.”

“Then who was it?”

“Who helped you test this cultivation method?”

Theme: Where there's a will, there's a way.