Resolved questions
Which number system do I use for ordinal numbers? Are there different counters, too?

첫번째 once 첫째 first
두번째 twice 둘째 second
세번째 three times 셋째 third
네번째 four times 넷째 fourth
다섯번째 five times 다섯째 fifth
여섯번째 six times 여섯째 sixth
일곱번째 seven times 일곱째 seventh
여덟번째 eight times 여덟째 eighth
아홉번째 9 times / 9th
열번째 10 times/ 10th
열한번째 11 times / 11th
열두번째 12 times / 12th
열세번째 13 times / 13th
열네번째 14 times / 14th
열다섯번재 15 times / 15th
.....
스무번째 20 times / 20th
스물한번째 21 times / 21st
....

....
백번째 one hundred times / one hundredth
백한번째 one hundred and one times / one hundred and first
백두번째 102nd
백세번째 103rd
...
천번째 1000th
천한번째 1001st
...