Yongdusan Park is a landmark, but it was a separate area from the existing urban organization in Busan. It is an exclusive relationship between mountains and cities. The concept of this project is to change the relationship that a mountain limits the city, and the city destroys mountain to new environment where both cities and mountains are “win-win”. It is a natural terrain of a mountain-like architectures where nature environment like plants and mountains and artificial structures come together and live together. The plan is to design a square in the mountain valley, and the green space park where underground ground is mixed with terraces on the slopes of the valley.