The Sino-Korean number 사 [sa] stands for FOUR (4)
The Sino-Korean number 삼 [sam] stands for THREE (3)
The Sino-Korean number 오 [o] stands for FIVE (5)
The Sino-Korean number 육 [yuk] stands for SIX (6)
The Sino-Korean numbers 일 [il] stands for ONE (1).
The Sino-Korean number 칠 [chil] stands for SEVEN (7)
The Sino-Korean numbers 이 [i] stands for TWO (2)