My phone number starts with 010.
The password is 1 2 3 4.
Take bus number 100.
It is 10,000 won.
Please give it in 50,000 won bills.
It is 200,000 won.
Please go to room 204.
Let's meet at 2 PM.
It takes 30 minutes.
It is January 1st.
I am in Korea for 6 days.
It's a 3-day, 2-night schedule.
Turn at the first alley.
Go out the second exit.
Try counting the numbers.
One, two, three, taking a picture!
It dropped below zero degrees.
I am 100 percent sure.
Please give me a 1,000 won discount.
I need one million won.
One of the steepest and most fascinating learning curves for foreigners living or traveling in South Korea is mastering the dual number system. Unlike English, which uses a single set of numbers for everything, the Korean language uses two entirely different sets of numbers side by side every single day: Sino-Korean numbers (derived from Chinese characters, 한자어 - Hanja-eo) and Native Korean numbers (고유어 - Goyu-eo). Why do they need two? Because they have systematically divided the world of counting! Sino-Korean numbers (Il, I, Sam, Sa, O...) are generally used for things that feel "abstract," mathematical, or exceptionally large. You use them for money (Won), dates, minutes, seconds, addresses, math, and phone numbers. For example, if you are paying 10,000 Won for a meal, you use the Sino system and say "Man Won". On the other hand, Native Korean numbers (Hana, Dul, Set, Net, Daseot...) are used for tangible, physical things that you could historically count with your fingers. You use them for counting physical objects, the number of people, your age, and the hours on a clock. Telling the time is actually the ultimate brain-teaser for learners: the hour is spoken in Native Korean, but the minutes are spoken in Sino-Korean! For instance, to say 2:30, you say "Du-si (Native 2 for the hour) Samsip-bun (Sino 30 for the minute)". While it certainly takes some mental gymnastics and practice, mastering exactly when to use which number system is a clear, undeniable sign that you are moving from a simple tourist to an advanced and respectful Korean speaker.
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