<https://korean.stackexchange.com/a/159> doesn't answer my question also mooted on [HiNative](https://hinative.com/en-US/questions/3520802). This distinction feels illogical and senseless to me. What's the reason or rationale?

Here's one example from Girls' Generation. When they introduce themselves, they always count forward — 하나 , 둘, 셋, we are Girls' Generation. But Yu Ri Kwon counts backwards at [13:57](https://youtu.be/qoo7Tdyn5sY?t=837) — 삼, 이 , 일.