7.3 Billion Hearts

The world has discovered 7.3 Billion hearts. It's not a machine, it's not an alien signal, it's the heartbeat of a living person. Since that day, seven billion people have been forced to feel the emotions of the same stranger. When he is happy, the global happiness index soars instantly; when he collapses, suicide intervention hotlines in major cities are full at the same time. Scientists call him "source". The media calls him "the sharer." The United Nations established a special task force, codenamed "Heartbeat". The world's top laboratories are tracking him - satellite positioning, big data analysis, AI emotion modeling - all means have been exhausted, but they can't find who he is. Former reporter Li Xiang is tracking him in another way. Lin Shen, who had insomnia, was recording him in Excel. Chen Xiaoman, who wanted to die, is alive today because of a certain happiness he had. But they don't know—— Above it all, there is a being watching. It does not save, it does not destroy, it does not interfere. It just feels like: fun.