Seattle, Washington, is located in the Pacific Time Zone (PT), which is UTC-8 during standard time and UTC-7 during daylight saving time (DST). Seoul, South Korea, is located in the Korea Standard Time (KST) zone, which is UTC+9.
During standard time, when it is 11 am Thursday in Seattle (PT), the time in Seoul (KST) would be:
11 am Thursday in Seattle (PT) + (UTC+9 - UTC-8) = 6 pm Thursday in Seoul (KST)
During daylight saving time (DST), when Seattle observes UTC-7, the time in Seoul (KST) would be:
11 am Thursday in Seattle (PT) + (UTC+9 - UTC-7) = 7 pm Thursday in Seoul (KST)
Therefore, when it is 11 am Thursday in Seattle, Washington, the day and time in Seoul, South Korea, would be 6 pm (or 7 pm during daylight saving time) on Thursday.