Rain (비, bi) carries deep agrarian roots in Korean dream tradition — in a farming society, rain wasn't a nuisance, it was survival, and that history still shapes how the dream is read today. A gentle, steady rain is generally read as blessing and abundance arriving, close in spirit to a money or gold dream but softer and less immediately transactional.
A heavy downpour or storm shifts the reading toward emotional release rather than pure fortune — a big, sudden rain is often connected to pent-up feelings finally coming out, or a difficult situation reaching a head and then clearing. This lines up closely with how dream psychology generally treats rain and storm imagery: an external expression of an internal emotional buildup.
Getting soaked by rain, especially unexpectedly, is read as being deeply affected by circumstances around you — for better or worse depending on the rain's overall tone in the dream. Standing under an umbrella or otherwise staying dry while rain falls around you is read more specifically as being protected from a difficulty that's genuinely affecting others nearby.
Rain stopping and the sky clearing afterward is one of the more reliably favorable sequences in this category — the traditional reading of struggle giving way to relief, mirrored almost exactly in ordinary waking language ("it'll clear up eventually") in a way that makes the dream easy to trust even without deep folklore knowledge.