Su Ran, who was unemployed after graduation, temporarily started taking out food. She thought she was just making some hard-earned money, until late at night she received a strange order with the address "Abandoned Unit Building 404" written on it.
The order notes are not less spicy and more vinegar, but cold death rules:
<Knock no more than three times>
<If the person opening the door has no shadow, he must not deliver the food>
"When the other party says thank you, you must turn around and go downstairs immediately. You are not allowed to look back."
