My Apartment Gets a New Neighbor Every Night

On the first night after moving into the old apartment building, Xiao Nian discovered that all the neighbors had changed. Even more terrifying, he was the only one who remembered.

A note was slipped through the crack under his door: Do not open the windows before six in the morning. On the back, another line was written in tiny letters: These words are only for those who remember.

Then one day, he counted the residents in the building and found there was one more than the blueprints showed.