Question: how do you say 1 2 3 in korean?
Answer: Korean numbers are written using symbols that are called “Hangul” and are not written using the Roman alphabet. X Research source ... 
1 하나 (Hana or Hah - nah)
2 둘 (Dul or Dool)
3 셋 (Set or Seht)
4 넷 (Net or Neht)
5 다섯 (Dausut or Dah suht)
6 여섯 (Yeosut or Yuh suht)
7 일곱 (Ilgup or eel gob)