The phrase "whole concept" refers to understanding or considering something completely, without leaving any part out or missing anything important. Full definition
Then I met my current boyfriend, Moro, who is 5 years younger than me, I felt that whole concept of relationships changed, all the way around. (baxterst.org)
The whole concept of entrepreneurship is that you're building something that doesn't exist. (entrepreneur.com)
If we failed, their whole concept could collapse. (entrepreneur.com)