위에(wi-e, wie)
'위에' indicates the exact top or surface of something, used to specify location precisely.
When to use
Exact location, On surface, Physical contact possible
The nuance
'위에' is the noun '위' plus the particle '-에', indicating the exact position on top of something, mainly for specifying location.
위(wi)
'위' generally refers to the upper part or top of something, functioning as a noun or adverb for position.
When to use
General location, Abstract position, Noun function
The nuance
'위' is a noun indicating the upper part of something, used alone or with particles to indicate position.
위쪽(wi-jjok, wijjok)
'위쪽' adds directional nuance to '위', emphasizing the upward direction or side.
When to use
Directional emphasis, Upward movement, Abstract direction
The nuance
'위쪽' is formed by adding the directional suffix '-쪽' to '위', emphasizing direction as well as position.