In the cracks of time, there is another world, which people call - Infinite.
In Wujian, there is a letter library, and the owner of the library will quietly select suitable people and introduce them to the library. Remove the monster "Mo Ran" that polluted the letters for them, and help them recover their lost emotions and past stories.
College student Chen Qiaoluo heard about the existence of Wujian Letter House and playfully submitted his name. However, he was selected and became the first and only employee there.
Chen Qiaoluo originally thought that everything was a coincidence, but due to the curator's intentional or unintentional prompting, he discovered the connection between his adoptive father and the curator. And the reason why he was selected by the curator Qiao Lengping didn't seem to be because of the joke-like reason when they first met.
In letters that span time and space, Chen Qiaoluo gradually grows up, and the secrets hidden by the curator begin to be noticed by him.
In the world of the last letter, Chen Qiaoluo met Qiao Lengping and Chen Ninghui when they were born. After witnessing the collapse of the world's laws, Chen Qiaoluo finally saw the truth of that year. It was a tragedy that the curator had long known but could not express.
Concept: The letter you receive is the condensed emotion of the sender