When he was eighteen years old, Lin Mo committed the biggest taboo in the village - looking at the ancient well on a full moon night. He saw something crawling out of the well, and the thing saw him.
In order to escape the ensuing terror, Lin Mo fled to the city, thinking that steel and concrete could block those supernatural pursuits. But he was wrong. Cities are just another form of hunting ground.
In his new apartment, no one has ever stayed in Room 404, but footsteps can be heard every night; when the company works overtime until early in the morning, the sound of an old-fashioned typewriter will suddenly sound in the empty office area; what is even more frightening is that whenever he takes the elevator, there will always be a non-existent "B5" on the floor button, and everyone who presses this button will appear in the ancient well in his hometown the next day, beyond recognition.
Lin Mo gradually realized that he was not a victim, but a "sacrifice". A hundred years ago, his ancestors reached an agreement with a certain existence to maintain the balance between the city and the countryside through bloodline continuation. Now, this contract is about to expire, and he is the last sacrifice.
But Lin Mo refused to accept his fate. He must uncover the secrets beneath the city and find the "other well" that connects the city and the countryside before the next full moon night. However, when he finally stood on the top of the tallest building in the city and looked down at the chessboard-like streets beneath his feet, he was horrified to discover that the entire city was a huge spell, and he was standing in the middle of the "wellhead".
