In the modern city "Lancheng" where technology and data are intertwined, a series of bizarre secret room disappearances have occurred. The victim disappears without leaving a trace, leaving only a strange, incongruous, handmade object at the scene. Ling Shuang, the elite detective of the city's criminal investigation detachment, is known for his meticulous logic and persistence in evidence, but he is helpless in front of this case. All clues point to areas that cannot be explained by science.
In the dead end of the investigation, she met Su Yue, a mysterious young man who hid in the city and ran an antique shop called "Wenwu Zhai". Su Yue possesses an unknown secret: by touching objects, he can feel the "echoes" they carry - those unforgettable emotions and memory fragments.
A cold piece of evidence, in Ling Shuang's eyes, was an indecipherable dead object, but in Su Yue's hands, it was the only key to the truth. One is a realist who uses logic as his sword, and the other is a mystic who uses perception as his boat. When unbreakable reason collides with unspeakable intuition, they are forced to form the most unlikely of partners, working together to dive into the shadows beneath the city's glamorous exterior to hunt down a "Dream Weaver" who uses "echoes" as a weapon. They must find the murderer who can completely erase people from reality before the next "Echo Box" is opened.
