The Brothers' Stack of Rice 4

Did you make sure my brother did not notice a change in the stack of rice? It's weird, though; my stack of rice hasn't changed one bit. Don't you think so, too? This is why... um... can you go back to my brother's house once more?

Please, please make sure my brother does NOT find out about this.

I'm sorry that I asked you to do the same thing twice.

I see a stack of rice stacked at the garden of Chil Sung's house. Secretly, I brought out a sack of rice and laid it unnoticeably on top of the stack.