The story takes place in a country that does not exist, in the near future. This imaginary country is located in East Asia, belongs to the Chinese cultural circle, and uses Chinese and Chinese characters. This is for the convenience of narrative. It is not as vast as China, but consists of a peninsula and several small islands. Its situation is similar to that of Japan and South Korea today.
More than ten years ago, a young man in this country founded the decryption website "Transparency", through which anyone can publish unknown secrets. As a result, he was deported and his whereabouts are unknown. More than ten years later, his son returned to his motherland and became a stranger in his hometown. This young man showed a door to the people who loved him. Behind the door seemed to be a glorious utopia, but was it really so?