Top entertainer in a new world, ruling with a platinum fist

A black-bellied idol trainee who is about to debut opened the door to the office for his contract signing, and finds himself in a different world, named Sartren. Having no marketable skills he decides to continue working in the entertainment industry, but: *screechy song plays in the background* "What in the world is that?!" "It's the number one song, isn't it good? You're lucky that I had tickets to listen to this they disappear fast." "Mama Mia." If any god is out there put me out of my misery, this is horrifying. Then he tried going into drama and film, but: "I-I'm speechless, all this was done in one room?" My eyes, they burn!!!!! "I know right?! Isn't this the best film ever?!" Then he thought to go into novel writing, remembering the plots to some of his favourite books, but: "......" "I can see that you are astounded by our literary works, this is the current bestseller." "..... I've had enough! I can't bear to see anymore entertainment!!!" Who uses an essay as a book?!