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적이 있었다

had done before

→ 적
phrase Common #1,663
had done before Used to describe a past experience. It commonly follows a verb in the form -(으)ㄴ 적이 있다; 있었다 makes the construction past tense.
KO: 예전에 그런 실수를 한 적이 있었다.
EN: I had made that kind of mistake before.

우주선에 타고 있는 동안 언젠가, 내가 어떤 모습으로 자랄 수 있을지 선택지를 받은 적이 있었다.

At some point during the spaceflight, I was given a choice about what I could grow up to look like.