The director group went all over the country to look for actors, and Changchun Li Yanmei Star Art School was the audition base. I don't know where you are from. You see, all the players in Changchun, Jilin Province have passed the training of the school and rehearsed several levels of programs before participating. You can't just sign up. The director group must have seen it and thought it was ok. People on the Avenue of Stars think that you can participate in the program, and even the travel expenses and accommodation of the actors are provided free of charge.