Old Man Opens Blind Boxes in Turbulent Times

Old Man Opens Blind Boxes in Turbulent Times Plot:

In turbulent times, a lonely tomb keeper old man buys a mysterious blind box in the market to exchange for winter grain. He expected rice or flour, but got life-saving medicine, a child's amulet, and a secret letter that can determine the city's defense. The original owner of the blind box is a lurking spy, and various forces and city patrol soldiers who track him down target the old man to seize the secret letter and silence him. To protect the orphan girl he picked up, the old man is forced to handle crises through every choice of opening the blind box: should he hand over the secret for stability or stick to his conscience for vitality? Every time he opens the box, it hides a life-and-death game.