Synopsis

A game developer, Song An, encounters a bug in his game that creates an infinitely mineable area. He turns this into an incredibly difficult 'easter egg' dungeon, but later somehow experiences a fight in that dungeon with an overpowered boss. After being defeated, he finds himself back at work, seemingly before the game was released, leading him to believe that he traveled to the past due to a bug in the game itself, now trying to understand what's going on.