Genius pharmacist Cheng Yan is severely allergic to jacaranda, but he can only smell the cedar fragrance on transfer student Jiang Yubai. When he discovered in the laboratory that the start-up password for the other person's bionic heart was actually his own initials, the medical accident that had been buried for twenty years returned. This heart-pounding experiment that started with a spectrometer will eventually use decoded expired love letter specimens to inscribe a new symbiosis formula in the growth rings of jacaranda.
Concept: At the boundary between youth and science, two teenagers coded by fate teach each other that the real cure is not to tamper with genetic data, but to learn to nourish spring in the scars.