Let me recommend you a novel called " Korean Entertainment, Please Sign For It ". This novel was written by the author, Erli Thirty. The plot of the novel started from delivering food and meeting Cui Xin 'ai. The female protagonist was reborn by the system due to an accident. After that, she began her own path in Korean entertainment and entered the filming location of " Extra " with the familiar Cui Xin' ai. Yes, Cui Xin 'ai is the female lead of the extras. There are many plots and scenes related to this Korean drama in the novel. I hope you like my recommendation.😗