Who is undercover? The words are as follows: steamed buns-soup buns, lavender-sky, rich second generation-Gao Fushuai, living expenses-pocket money, microphone-megaphone, Degang Guo-Zhou Libo, library-library.

Who is Undercover is a game of language expression, knowledge and imagination. It is very popular and interesting all over the country. The game evolved from ghost hunting and was named Who's Undercover after the revision of Happy Camp.