<Seoul Panorama 2123> is a message sent from the future, the year 2123, intended for the well-being of Daemo-Guryong Mountain. Adopting the format of a ritual offering, the exhibition prompts reflection on the past and present and entrusts the future of Seoul to ‘you.’ The exhibition, through research, models, and open-source software, highlights mountain destruction and invites not only experts but also citizens to contribute. The mountain, entwined with interests from the National Intelligence Service to apartment complexes, faces alteration due to human habitation and future infrastructure. As automated infrastructures by tech companies could become geological agents in the Post-anthropocene, an inclusive planning method is essential. Our master plan algorithm, which integrates data centers into residential and office spaces without damaging mountains, will be shared as open source for wider application. It proposes an infrastructure grid based on contour lines and uses gamification to encourage participation.