Let me have a cameo?

The stifling atmosphere between Elliot Gong and Ethan Lu was abruptly interrupted when Arnold Shen suddenly intrude at Elliot Gong's tent.

"Young master Lu!" Arnold Shen immediately greeted after a slight bow. He was grinning from ear to ear as if he had seen an old friend.

The moment Ethan Lu saw Arnold Shen, he smiled brightly. "Director Shen! Good to see you!" 

Ethan returned the same courtesy before he stood from his seat and welcomed Arnold Shen as if Elliot Gong's tent was his.

"Chu~?" Churu's forehead creased as she raised her invisible brows in confusion. 

Based on her observation, when Lexi informed him that she was considering going on an audition that would be directed by Arnold Shen, Ethan Lu didn't seemed he knew the guy. However, why does it seemed otherwise?