In the small glass bottle in front of Xu Shiguang, a fingernail-sized black worm was soaked in a special liquor in order to keep its body from rotting. Since he had come back, he had always been studying this small worm.

Because he always felt that he had seen it before...

"The notes left by the chief recorded more than 100 kinds of vermins, but there was no worm such as this in there." The old man carefully closed the notebook and looked for other documents. ...