The reasons for the mosaic of characters in the play are to respect privacy, avoid infringement, and attract audiences.

1. Respect privacy: Some actors are unwilling to disclose their real names or photos, or they need to protect their personal privacy issues, so the producers of "Conqueror 2" chose to mosaic. This is a sign of respect for the actor's privacy.

2. Avoid infringement: Some people believe that if photos of actors are used for commercial purposes without authorization or payment, their portrait rights will be infringed. Therefore, the producers of "Conqueror 2" chose to mosaic to avoid legal disputes.

3. Attract the audience: Some producers believe that creating a sense of mystery and attraction by blurring the image of the actors can better arouse the curiosity and interest of the audience. This strategy is common in some movies and TV series.