The Ninja World? Underestimate Me, and Face the Heaven-Defying Multiverse System!

System: This mission takes place in a wuxia world. You are a cultivator.

Protagonist: What's the target?

System: Kill Dugu Qiubai.

Protagonist: Who?!

System: The Sword Demon, Dugu Qiubai.

…

System: This mission takes place in the modern era. You will take someone's place.

Protagonist: Who am I supposed to kill?

System: Have you gone crazy? This is the modern era. You want to end up in jail?

Protagonist: So what's the mission?

System: Don't let anyone discover the Host's secret.

Protagonist: What secret? Do I even know about it?

System: When the time comes, you'll be the only one who knows.

Protagonist: Am I not a person?

System: There are two of us. You aren't alone.

Protagonist: I have no answer to that.

Protagonist: “Sorry, mission failed.”

System: “Get ready to have your body taken over.”

This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Do not imitate.