This expression is used when the speaker, after considering a number of possible situations concludes that something could be considered more or less the same as the topic or subject that has been mentioned. It has the same meaning as the expression -와/과마찬가지다.
Details
Kimchi Reader
Expresses that something is practically the same as something else.
Examples
이번 촬영은 꽤 잘<span class='focus'>된 셈이에요</span>.
It is as though I did well on this shoot.
그동안 열심히 준비했으니 거의 합격<span class='focus'>한 셈이죠</span>.
Since I prepared hard, it is as though I passed the audition.
이 정도면 절반은 성공<span class='focus'>한 셈이에요</span>.
At this level, it is practically half a success in the industry.