1.Sino numbers

: Remember Korean language was affected by China for a long time ago. 

So, some Chinese language things are still remained in Korean.  And Sino numbers are one of the examples. :)

As you can see below, it is easier and more regular

1 = 일[il] 

2 = 이[E]

3 = 삼 [Sam]

4 = 사 [Sa]

5 = 오 [O]

6 = 육 [Youk]

7 = 칠 [Chil]

8 = 팔 [Pal]

9 = 구 [Goo]

10 = 십 [Sib]

2. Native Korean numbers

1 = 하나 [Ha-na] / Reading 하나

2 = 둘 [Deul] / Reading   둘

3 = 셋 [Set] / Reading  섿

4 = 넷 [Net]/ Reading 넫

5 = 다섯 [Da-sut]/ Reading 다섣

6 = 여섯 [Yeo-sut]/ Reading 여섣

7 = 일곱 [il-gob]/ Reading 일곱

8 = 여덟 [Yeo-deol]/ Reading 여덜

9 = 아홉 [A-hob]/ Reading  아홉

10 = 열 [Yeul] / Reading  열