Be My BL Novel Model, Please

The following content is intended for mature audiences and may contain sexual themes, gore, violence and/or strong language. Discretion is advised.
He meets Yunu (??) as a customer. His impression was so intense he would be remembered immediately. Then, Yunu abruptly makes a strange request:

“Suddenly, please become the model for my BL novel.”

But that request was only the beginning.

Yunu had a completely different, hidden purpose, and Saebyeok (??), who couldn’t properly refuse a single word, quickly finds himself deeply entangled in Yunu’s world.

And finally, Yunu’s true, hidden identity is revealed—