한때

In a sentence

• 한때 나는 피아니스트가 되고 싶었어요.

  Once, I wanted to be a pianist.

  In this sentence, '한때' is used to signify a specific period in the past when the speaker had the desire to become a pianist.

• 그 배우는 한때 세계적으로 유명했지만 지금은 그렇지 않아요.

  The actor was once internationally famous, but not anymore.

  Here, '한때' indicates a past time period during which the actor was globally renowned.

• 한때 많은 사람들에게 사랑받았던 음악이 지금은 잊혀져 가고 있어요.

  Music that was once loved by many people is now becoming forgotten.

  In this context, '한때' highlights the previous time during which the music was widely appreciated.