When did Didina become Princess Naya?

Season six. In Didina's TV series Dream Snow Field, the plot shows that she became Princess Naya in the sixth season. Meng Xueyuan's series is divided into six main plays, a biography and a movie. It is a very special magic TV series, and it is also a drama celebrating the 10th anniversary of Dongsen Kindergarten, which brings a brand-new visual experience to the audience.