After losing her parents at a young age, He An'an, whose legs are disabled and who has difficulty walking, runs a quiet little grocery store all by herself. One night, a young girl from ancient times mysteriously appears and trades wild vegetables for dried noodles. After that, hunters, scholars, and craftsmen begin arriving from the past, exchanging mountain goods, fresh fish, and handmade crafts for grain, paper, pens, and other daily necessities. Insisting on legal and fair trade, He An'an gradually brings her struggling shop back to life. Through helping people from ancient times, she also rediscovers hope. A single rolling shutter door connects two different eras.