In this area of Seoul there are many things to see - statues, museums, palaces, etc. This stream should be on your list - especially at night. Water is so important in Korean culture that they take opportunities to add more of it when they can and this is a fine example of that.
The colours, lights and sound are all stunning, relaxing, soothing. There is normally some music being played and the short walk it is in total is worth doing.
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