In Mirror City, a futuristic metropolis where memories can be edited and erased, Shen Ye is a top memory weaver. Day after day, he repairs or deletes his clients' painful pasts, yet he cannot piece together the truth behind the death of his lover, Lin Xi. An unusual assignment to verify the memories of a tech mogul turns out to be the key that unexpectedly opens a forbidden door to the past. When an unfamiliar melody in his client's memories resonates with Lin Xi's belongings, Shen Ye realizes he is being drawn into a vast maze built from lies, power, and human nature. To pursue the truth behind the echo, he must descend into the most dangerous depths of memory and confront a game of crime and punishment capable of overturning all of Mirror City.