You asked:

what time is it in usa if it's 9am in korea

  • 9:00 a.m. in South Korea is the same as 8:00 p.m. Eastern Daylight Time, 4:00 p.m. Alaska Daylight Time, 7:00 p.m. Central Daylight Time, 2:00 p.m. Hawaii-Aleutian Standard Time and 5:00 p.m. Pacific Daylight Time in the United States.
  • the United States
    the United States
    South Korea
    South Korea
    8:00 p.m. Eastern Daylight Time

  • 4:00 p.m. Alaska Daylight Time

  • 7:00 p.m. Central Daylight Time

  • 2:00 p.m. Hawaii-Aleutian Standard Time

  • 5:00 p.m. Pacific Daylight Time