Lin Jianxia, the owner of a junk shop, always receives letters from different time and space. The letters include the regrets of female students in the Republic of China, letters home from soldiers during the war, and monologues from future astronauts. She thought she was just a bystander, until an unsigned letter fell on the table. The letter read: "When the wind fills the branches, I will come to pick you up." When the handwriting on the letter began to become hot, and when people from different time and space met in the junk shop, Lin Jianxia realized that what she kept was not a letter, but an obsession that spanned time and space.
