Follow-Up of Nine Gates

"When one day you find that you are no longer yourself and have become someone else, tell me what you will do? Waiting online!!!" I squatted in the toilet with my mobile phone in my hand and typed out this question on Facebook. A group of fun people were very clever, but one person replied: You are still you, but everyone around you treats you as someone else! Like any trace of your original existence being replaced by another person?