올라가다(ol-ra-ga-da, olragada)
A verb used when moving upward from a lower place to a higher place, away from the speaker's current position
When to use
Moving upward from speaker's position, Going to upper floors, Climbing mountain peak
The nuance
Use 올라가다 when moving upward from a point lower than the speaker or reference point, indicating movement away and upward.
올라오다(ol-ra-o-da, olraoda)
A verb used when moving upward from a lower place toward the speaker or reference point's position
When to use
Moving upward toward speaker, Coming down from upper floor into room, Approaching speaker's location upward
The nuance
Use 올라오다 when moving upward from a lower place toward the speaker or reference point, indicating movement closer and upward.