What kind of sparks would they spark when the movie starred by Aaron Kuo, Duan Yihong, and Zhang Zifeng entered the promotion period? As a fan of online literature, I don't have any specific information about the movie, so I can't provide any specific information about the interaction between Aaron Kuo, Duan Yihong and Zhang Zifeng during the movie promotion period. However, during the promotional period, the interaction between the actors might gradually unfold due to the promotion of the movie. During the promotional period of the movie, actors would usually interact with fans through social media or other channels to share bits of information about the movie and their own experiences. If Aaron Kuo, Duan Yihong and Zhang Zifeng were to star in the movie, they might share their views and feelings about the movie with their fans through social media during the promotion period. They might even act in the movie to attract the attention of the audience. In addition, actors might also cooperate with each other during the promotional period of the movie, such as acting opposite each other or co-acting as the main character. If Aaron Kuo, Duan Yihong, and Zhang Zifeng were to star in the movie, they might attend various activities together during the promotion period to show their tacit understanding of each other. The movie starred by Aaron Kuo, Duan Yihong, and Zhang Zifeng had entered the promotion period. The interaction between them might gradually develop due to the promotion of the movie. The specific situation needed to be decided according to the situation of the movie itself.