Summary
Originally a vibrant and cheerful young man, he joined a production company. However, this company, a so-called "black corporation," forced him to work overnight without overtime pay from the first day, and there were many days when he couldn’t go home. This prevented him from living a humane life, leading to depression.
Due to a pandemic caused by zombies, it became unnecessary to go to the company, which allowed him to regain his positive humanity all at once. Contrary to his time as a company employee, he started to prioritize living life as he wanted.