Countdown in Pupils

I was just an ordinary person. I thought I would spend my whole life like this, until a serious illness suddenly occurred and I could see the countdown of my life... At first I could only see my own, but then the scope gradually expanded and the functions gradually improved. I could see the increase and decrease of the countdown, and I could see the sudden drop of the countdown of others. I thought this was a kind of happiness that could avoid disasters, but little did I know that this was just the beginning of a nightmare...