0 used to say that something is continuing to happen now -- 아직
Do you still play basketball?
1 used to show that you did not expect something to happen -- 그런데도
2 used to say that something continues to be possible -- 여전히
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
길이 아무리 길어도 차근차근 완주할 수 있고, 발자국을 표시하지 않으면 아무리 길이 짧아도 완주할 수 없습니다.