Pianist Su Yan suffered an earthquake during surgery, and his right hand was accidentally destroyed by the surgeon, Gu Yu. After being forced to live together, he found ballet dancer Ruan Qing's belongings in Gu Yu's closet, and was even more shocked to realize that he and Ruan Qing had the same scar location. When he coughed up blood and dyed the notarized certificate of Ruan Qing's heart donor "Xu Zhe" red, Su Yan fell into the suspicion of a substitute.
The appearance of Xu Zhe made everything go out of control - the transplanted heart contained Ruan Qing's memory, and the spinal scars matched Ruan Qingwu's injuries. The three of them fell into the vortex of organ memory and intergenerational transmission of trauma. At the medical hearing, Gu Yu's heart tattoo revealed the medical codes of three people; on a rainy night on the rooftop, Su Yan blocked the door with a wheelchair, and Xu Zhe rang the doorbell in the rain: "Doctor Gu, my heartbeat is imitating the sound of rain."
They are locked in a painful closed loop: the doctor becomes a caregiver, the pianist controls the wheelchair, and the heart parasite monopolizes the heartbeat. The siren of the ambulance is always hovering in the rain, like an unstoppable ECG monitor.
