How was Yang Mi chosen by director Chen Jialin to play Tang?

Yang Mi was not a quiet temper since he was a child. Children from other families have gone to learn calligraphy and piano, but she can't settle down, so she went to a training class for young actors. It happened that Chen Jialin's "Tang" chose an actor, and 4-year-old Yang Mi was lucky enough to be chosen to play Princess Xianyi in "Tang".