Returning paper artist Xin Yan goes back to Mailbox Alley. Facing abandoned old mailboxes and retired postman Uncle Xin guarding the old post pillar, she resolves to build a shared voice wall. Teaming up with express delivery youth A Kuai, child Xiao Dou, and handicraft neighbors, through livestream criticism and rain-damaged material dilemmas, she relies on everyone's persistence to complete the repair of the old mailboxes. They open repair and paper flower handicraft classes, launch a voice market, and transform the abandoned newsstand into a voice station. Old items circulate and operate, old craftsmanship glows with new life, and neighborhood residents drop voices into mailboxes to hear each other anew.