A rainbow (무지개, mujigae) is one of the most purely hopeful images in this entire tradition — a direct symbol of hope and reward arriving specifically after a hard stretch, since a rainbow can only appear once rain has already fallen. The dream carries that sequence built into it: struggle first, then a bright, generous payoff.
A rainbow appearing after a storm within the same dream is read especially favorably — the difficulty and its resolution shown together, which interpreters treat as confirmation that whatever hardship you're currently facing has a real end point rather than being open-ended.
In older Korean folklore, a rainbow is sometimes read as a bridge between two worlds — the human and the divine, or the ordinary and the extraordinary — echoing myths where it connects heaven and earth. A dream of walking across or toward a rainbow taps into this reading, treated as movement toward something significantly better than your current circumstances.
The honest caveat interpreters attach to this dream is built into the symbol itself: rainbows are fleeting by nature, and the tradition generally reads this as a gentle reminder to appreciate good fortune while it's here rather than assuming it's permanent — a rare case where the folklore and a sober, grounded read of the situation point in exactly the same direction.