"Dong, dong, dong, dong..." The dull knock on the door kept knocking in Li Yan's heart. He touched the fruit knife in his hand, knowing that this day was still coming.
When he woke up, Li Yan was the only one left in the world. Was it a natural disaster or a man-made disaster? Li Yan lived a cautious life, until one day a series of knocks on the door came from the world that should have been silent.
Intention: live a good life, no matter how miserable it is, you must survive, eh.