One rainy night, a strange letter was slipped into my cafe. It was addressed to me, Shen Wanchang, and signed by Lin Qing, my ex-girlfriend, who died three years ago. It contained only one sentence: “Come see me in March.” Ten years ago, I was drowning in debt when my girlfriend Lin Qing betrayed me without a second thought. Where could this letter, which had crossed the boundary between life and death, have come from? To investigate this bizarre matter, I followed the clues to trace the letter’s origins, searching for traces of Lin Qing’s life before she died and trying to uncover the truth behind it. As my investigation went deeper, a long-lost yet deeply moving past gradually came together.