The unit of currency is Korean Won (KRW), expressed as W. Coin denominations are W10, W50, W100 and W500. Bank notes are W1,000, W5,000, W10,000 and W50,000. As of October, 2019, the exchange rate is approximately W1,150 for $1 (USD).
Visa, and MasterCard are accepted at almost all retail outlets, but Diners Club and American Express may only be accepted at major hotels, shops and restaurants in the larger cities. Check with your credit card company for details on merchant acceptance and other available services.
Outlets for 220 Volts/60Hz are mostly used in Korea. In order to convert the power into 110 volts please contact the hotel housekeeping and current transformer will be available.
Government office hours are usually from 9am to 6pm on weekdays and closed on Saturdays and Sundays. Banks are open from 9:00am to 4:00pm on weekdays and closed on Saturdays and Sundays. Major department stores are open every day from 10:30am to 8pm including Sundays.
Korea is 9 hours ahead of Greenwich Mean Time (GMT +9) and does not observe daylight savings time.
http://www.worldtimeserver.com/time_converter.aspx
Police : 112 / Fire & Ambulance : 119
※ These services are available 24 hours.