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The protagonist Sheng Simon's grandfather, Sheng Piyin, is a sealer. Their family has a roster passed down from generation to generation, which contains the terrifying monsters that their family has sealed for generations. But the day before Sheng Piyin planned to retire, a monster in the roster somehow broke through the seal, escaped from the roster, and tried to release the other monsters inside. This led to Sheng Piyin, in order to prevent other monsters in the roster from being released, he spent his own life to barely save part of the roster, but still allowed most of the monsters in the roster to escape. In order to complete the roster again, the grandfather wanted to hand over this important task to his son, but his son disappeared, and at this moment the protagonist Sheng Simon pushed in the door...