I agree with @michelle park 일상 means daily life. More information here : http://hanmun.vdegenne.com/일/日/0/일상 이면 is 이다 (to be) + 면 (conditional) therefore 이면 means 'if it is'. 일상이면 means 'if it is daily life' (in a literal way). The example that gave @michelle park would be, in a literal way : 'if it is daily life where I can drink coffee, I'd be satisfied'. 파이팅!

I would say that : 일상이면 = 일상 + 이면 일상 means daily life 이면 ( 한다면 ) : might be translated into what if or if For example, 커피를 마실수 있는 일상이면, 난 만족해. If I can drink a cup of coffee in daily life, I am satisfied.