Three years ago, writer Zhou Yuan's wife Lin Xia left her coat and mobile phone on the side of a Venice canal and disappeared. The police searched for three months and found only the diary she carried with her - written in a code that only she could decipher.
When Zhou Yu'an finally learned to stop staring into the abyss, the abyss looked back in another way. The appearance of Su Li broke his quiet despair. This girl with the same face as Lin Xia brought the key to the diary and a creepy greeting: "Do you want to know what she wrote in the end?"
As the pages of the diary are decrypted, the intertwined stories of two time and space emerge: Zhou Yuan and Su Li in reality are pursuing the truth among clues; Lin Xia in the diary records the strange cases she comes into contact with as a psychiatrist - patients who claim to be "replaced by another self". When Zhou Yuan discovered that the last patient number Lin Xia received before she disappeared happened to be Su Li's birthday, he was shocked to realize that this love was a carefully designed trap from the beginning.
The scariest thing is not that the person next to you is hiding a secret, but that when the secret is revealed, you can no longer tell whether the person in front of you is a lost love or a phantom that has never existed.
