Yuan Bites Jiuhuan

"This is a story about 'effect' and a legend about 'cause'. "Yin" and "Yang" deal with the harassment of outside visitors and collect "abnormalities" that come to the world. They hold the broken sword [Nameless], which contains the truth about the birth of the world and all the memories of a man named Jiang Xingchen. And below is where the story begins: countless doomsdays, twisted rules, a group of people struggling to survive, the survival of several different worlds, and a survivor who is about to reveal the ultimate secret of the world.