As a senior answer, I think that Sun Li's dislike of Peter Ho may be caused by the differences in their personalities and hobbies. Everyone has likes and dislikes, which is normal. Moreover, in the entertainment circle, the feelings between stars do not depend entirely on their role relationship in the play, but more on private communication and understanding. So we can't confuse the plot of the play with the relationship between the actors.
Generally speaking, Sun Li's attitude towards Peter Ho is open, and she doesn't particularly like or hate him. As an audience, we should respect and understand the personal feelings of the stars, and don't over-interpret and guess the relationship between them. After all, the entertainment circle is an illusory world, and we can only feel their charm and talent through their performance on the stage.