Notes of a Demon Hunter

My name is Li Yu, codename is X. Ruins of ruins, and desolate landscape everywhere, This is what the city looks like before me. No one knows what happened. How did the high-rise buildings in the past turn into dilapidated ruins? Where is human civilization? So far, I have met only a handful of living people. Human civilization is probably over! A huge feeling of loneliness has always enveloped me, and I had to lie on the ruins made of reinforced concrete every silent and cold night, writing down everything I experienced with trembling hands to form this diary. Hope someone can see it. If there are any who survived, I would like to give you a warning. Whenever night falls, be sure to find a strong enough hiding place!