약속한

In a sentence

• 나는 친구와 약속한 시간을 기억하고 있다.

  I remember the time promised with my friend.

  Here, 약속한 is used as an adjective derived from the verb 약속하다 (to promise), modifying 시간을 (time).

• 그는 약속한 대로 행동하였다.

  He acted as he had promised.

  In this sentence, 약속한 is used as modifying 대로 (as/according to), signifying conformity to a promise.

• 우리는 서로에게 약속한 미래를 믿고 있다.

  We believe in the promised future to each other.

  In this example, 약속한 modifies 미래 (future), indicating a future that was assured or agreed upon by mutual promise.