The Demon Lord's Undercover Agent Doesn't Want to Study Anymore

He feeds on desire, and his identity changes a thousand ways.

In the utterly ordinary life of an undercover agent, an attacker suddenly appears.

When he first arrived in the human world, he impersonated a learned sect leader with paralyzed legs.

The attacker: My friend, your legs can still be cured. Let me massage them for you.

On a journey to the Western Regions, he was an exquisitely beautiful, fragile zither player.

The attacker: Beauty, can you play the flute?

Then he took the place of the other man's utterly loyal, masked shadow guard.

The attacker: What a waste to have such a pretty face getting involved in fights. How about becoming my concubine?

...I can still endure it. I can still endure it. I can't take it anymore! Damn it!

The receiver: Go to hell!

He's too strong. I can't beat him. Do I have to give in?

P.S. The blurb has been screenshotted and saved.

Theme: There is always more to learn.