After Rebecca left, the next artist who entered was Oliver. He was another cannon fodder character who was just mentioned in a few paragraphs by the author.
When Oliver saw the female lead struggling with her acting, he helped her out a bit out of kindness and human common sense.
However, the jealous male lead could not tolerate anyone approaching Vanessa Walker, especially men. Thus, he made Oliver suffer even when the latter only helped out the heroine without any underlying motives.
In the movie that they were in together, Oliver's role was suddenly changed. August had him changed into a villain.
The audience could not tolerate the type of villain Oliver had to portray, so he was bashed because of it, even if it was just a role given to him.