There was a stair in my house. It made by cement and holder was made by inox.

When we hold the holder walking down or up, the holder sounded cling, cling.

At 11 PM, I usually heard CLING CLING. I thought someone in family was walking up or down the stair.

But it happened everynight, same time.

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I wondered.

One night, the sound CLING CLING appeared. I sat up and listened carefully. Someone was walking on the stair holding stair holder.

'Who is that?'

I got down from the bed, opened door to see.

The electricity lamp was turned off. No one there.

I walked to check down stair. Everyone was in room. So who was that walking at late night?

Next morning, I told my sister about it. My sister said, "I know. It's house spirit."