This location, situated between the future Yongsan Park and the Han River, holds immense potential to be transformed into a future ecological hub for Seoul. Additionally, it presents an ideal opportunity to showcase Korea’s symbolic landscape. Our proposal involves introducing a new terrain, presenting a vibrant landscape that resiliently addresses environmental issues while embodying the fundamental characteristics of Korea’s interconnected mountain ridges. The cluster of undulating topography is meticulously formed through innovative interpretation, active disturbance, and careful manipulation of the urban topography. This new topography exhibits adaptability to rising sea levels and the prevention of natural disasters caused by abnormal weather patterns. The hills, varying in size, shape, height, and slope, establish harmonious connections with the surrounding areas and create diverse green, water, programmatic, and essential functional spaces within the city. The varied forms of the land prioritize ecological and landscape dynamics, instilling a sense of joy among citizens. Consequently, the resulting third nature, “landscape” fosters a city that evolves and adapts to unexpected environmental changes, ensuring its long-term sustainability.