Nineteen-year-old Su Xiaotang has always had a secret: when she touches old things full of stories, she will see fragments of memories sealed inside. A hairpin from the Republic of China allowed her to taste the farewell kiss in the flames of war, and an old poetry collection allowed her to hear the silent secret love of a girl with low self-esteem. She thought it was just an overly sensitive hallucination - until the silver pocket watch left by her grandma led her to the non-existent side door deep in the university library on a deserted night.
Behind the door is the "Time Trace Library".
A secret place that collects all unrecorded human emotions and memories.
