The phrase "interesting backstory" refers to a person's or thing's past experiences or history that is intriguing, captivating, or unique in some way. Full definition
Plus, the company has a pretty interesting backstory as well. (skipthemed.com)
The lack of interesting backstory or a truly «super» power makes for a boring outing from the usually reliable stable. (rottentomatoes.com)
It sounded promising and has a fairly interesting backstory but with ok dialogue and simple storyline, it didn't blow me away. (invisioncommunity.co.uk)