Psychologist Wen Nian has a secret: she can see the physical form of other people's hearts. The knot in the heart of lawyer boyfriend Gu Chen is a red rope, until she discovers in court that the other end of the knot is tied with a photo of the murderer who killed her parents ten years ago.
On the night of the breakup, Wen Nian stole the case information from Gu Chen's safe, and a yellowed amusement park ticket fell out of it - the same ticket she remembered from "the last trip with her parents". During the hypnosis diagnosis and treatment, she was shocked to realize that the knot in her heart was a music box filled with broken glass, and that the same intact music box was hidden in the secret room of Gu Chen's study.
On a rainy night, Gu Chen folded the case files into paper boats and put them into the river: "I took this case to find out who tampered with your memory."
When the truth came with the tide, Wen Nian finally understood——
Some knots require two people to break them together, because the ends of the rope are in each other's hands.
Under the moonlight, two music boxes played out-of-tune chords at the same time.
