Undergraduate / "Film? Why do you want to study that?" How did I changed my interest to liberal art [4]

I think "a interest that is so meaningful they believe their application would be incomplete without it" or "a problem you have solved" could be the choices. But I do not know whether second would work...I am confused finding the key problem...

About what you suggested, I think I do described all of them, and I am telling why I changed and why I wanted to change. I was just trying to say that film was appealing to me, but as the same time I was struggling whether to further explore it or not, because it needs basics about art or more things that are different from which science I need to learn. I talked about "the difference between my interest in the sciences and liberal arts" in paragraph 4, and "What attracted you to Liberal Arts", because there are many things that attracted me at the same time, including the singer that you asked to to replace it last time, so I just simply talked about how I was interested in film in paragraph 2&3.

and I talked about Titanic is because Titanic is the first leading movie that I get to have a big picture of what is behind the scenes, and know the portion of art in a film.

but thinks for all that, hope you can give me more suggestions.