Light and Shadow Intertwined

My name is Zheng Xing. I got on a different train when I was returning home from vacation and found a friend who had been missing for three months... What does it mean that there is a friction between two worlds adjacent to ours and a bunch of supernatural phenomena called Erhu. What is going on in this world... My name is Zheng Xing. He didn't leave much power to me, but it was enough to get you guys out of our world.