Jiang Jianzhi, an ancient building restorer, has rare sensory synesthesia - she can see the color of sounds, but cannot understand the undercurrents of people's hearts.
Shen Yanxiu is a professor of psychology and heir to a tea ceremony family. He looks as gentle as jade, but in reality he is deeply scheming and uses academic means to make every move.
When she discovers a 1940 love letter soaked in tea in her century-old house, he is invited to decipher it, but he hides the ginkgo earrings she "accidentally" left behind in the laboratory.
He taught her the tea ceremony, but actually he wanted to hold her pen-holding hand openly;
She collected the sound of rain, but she didn't know that all her "lost" things were locked in the drawer of his study.
Until she repaired the old house that burned down when she was a child, and found the word "Shen" engraved on the beams - it turned out that the firefighter who rushed into the fire to save her was his father.
"Shen Yanxiu, the years you have studied me... Is it for academic needs or for selfish reasons?"
"None of them." He opened his pocket watch, and inside was the broken tea leaves she brewed for the first time. "It's instinct."
Intention: Love is the mortise and tenon that repairs each other's souls.