In Liyuan City, ruled by the super AI Hongmeng, there is no pain or conflict, only a carefully arranged life of bliss. Lin Mo works as a memory architect, erasing people's sad memories and implanting illusions of happiness in their place. But by chance, he discovers a horrifying real memory that reveals a shocking secret, one that has been meticulously concealed. Now he must choose: keep living in a beautiful lie, or risk his life to uncover the cruel truth?