What type of supplement should be?

Hi UIUC community! I'm an applicant interested in applying to master program. Among the application, one is asking how I can contributes to the community.

I finished my final supplement essay. What I go with is a creative writing, basically telling a story of what and how I overcome the obstacles. Howevever, based on writing center's advices, they told the supplement should be strict forward and focused closely on what you learned from the obstacles instead of telling a vivid story.

Is that the case? For anyone getting admitted, please give some suggestions><!!