도 알고 있었다

also knew

→ 도
phrase Uncommon #6,454
also knew 도 means “also” or “too”; 알고 있었다 expresses knowing in the past.
KO: 나는 그 사실도 알고 있었다.
EN: I knew that too.

그들은 또 나만 몰랐던 사실도 알고 있었다.

They also knew something that I was the only one who didn’t know.

이제 직원들은 나를 알고 있었고, 내가 어느 날 올지도 알고 있었다.

By then, the staff knew who I was and knew I might show up any day.