Biological Invasion on a Rainy Night, Under Covert Investigation

The man was leaning on the sofa. The rain was so heavy that the rising mist made it difficult to see the outside world. The man's eyes were staring ahead, his emerald green pupils emitting a strange light. "Have you still not been able to get over that incident?" A black figure that looked like a woman emerged from behind the sofa. Her voice was slightly noisy, but the man could hear it clearly. "Hmph, maybe, but now I still have something I have to do." The man chuckled, and threw out an ID card with the two words "Liu Yuan" engraved on it. [Dear citizens, there are heavy showers in many places in this city. Please give me citizens - no - please. Citizens, please go out more and experience the baptism of heavy rain. ] (This work incorporates "Cthulhu" and "Weird Tales" works. The story will take Rain as the starting point and run through to the end. It will also touch on religious content, thus leading to the so-called "monsters" in the story.)