What do you mean by' dust on misty rain'?

Strange refers to a building, which is a path. We can imagine such an artistic conception: walking on a misty path, the breeze and drizzle fall on you, and the past in your heart is vivid. The person you miss so much seems to be still around, and nothing can stop you from missing. That man's voice is still ringing in your heart. In a flash, you suddenly return to the present and find that this person will never come back to you. Your mood is like dust. The phrase "dust on the misty rain center" describes a kind of artistic beauty. Literally, the dust in the heart can give full play to the imagination.