위(wi)
Refers to the upper part or higher position of an object or place.
When to use
Physical upper position, Higher rank or order, Relative height expression
The nuance
Use '위' to indicate the upper part or a higher place physically. It also expresses higher rank, priority, or order in sequences.
아래(a-rae, arae)
Refers to the lower part or lower position of an object or place.
When to use
Physical lower position, Lower rank or order, Relative lower position expression
The nuance
Use '아래' to indicate the lower part or a lower place physically. It also expresses lower rank, priority, or order in sequences.