As an "old things sorter" at the post office, Yang Xiao's job is to deal with letters that have been forgotten by time. He thought it was just a dreary job until he found a stack of stamps from 1943. Behind the stamp is the longing of a soldier named "Xiao Lin" for his fiancée "Amei" across the war. When he thought it was just a dusty love tragedy, his unique talent was activated - he could hear the remaining "voices" in old things. These stamps are not dead objects, they carry the spirit of Kobayashi's immortal obsession. In order to make up for this regret that spanned eighty years, Yang Xiao and Amei's granddaughter Shen Yuejian stepped into the unknown "world of old things". However, they soon discovered that the lovers' strong obsession also attracted dark organizations that coveted "soul energy". A protection and competition spanning two eras begins.
