Over the past 600 years, the Seoul City Wall has kept its original form as a fortress that both established the authority of a new dynasty and protected it from outside attacks. The four main gates and four small gates in the city wall were at the centre of people’s lives and the only passage through which men and commodities came in and out. In 2013, Seoul Metropolitan Government announced its plan to construct a pavilion that will reassert the cultural and historical value of the city wall, where the past and present can coexist, in hope that it make it more convenient for people to use. We first wanted to understand the experience of being on the the site, the people there and the relationship that had been formed between these occupants and the environment. On this point, ‘the scheme, while accommodating the topography, plays with it in a new way through a circulation that breaks out of standardized forms.’ You can enter the visitors’ pavilion, installed on the uphill slope, either from the trail or the park. By reducing the wall that blocks off the canopy and stairs, they have conceived of an open space. On the sharp incline leading towards the pavilion, the difference in the height of the two points of the uphill is up to 4m. To make a canopy suited to the terrain, a research on forms was conducted transforming basic figures by adding straight lines and curves. As a result, a structure connecting six triangles was built for the canopy, in which four triangles jointly form a larger triangle while two triangles, sticking into the ground on each side, act as pillars. Broadly seeing, three triangles are forming a large gate that lead to the fortress. A terrace with six steps can be used as a resting place for the visitors and also stands for the spectators at cultural events. We focuses on the public nature of the experiences of the users. Here, our experience includes a kind of the time travel, remembering the people who walked along the Seoul City Wall in the past and recognizing those of the present, and also the space travel that connects the stories of people from different regions. The things necessary to in the seemingly monotonous and blank spaces are human and time. Nothing but the colourful experiences made would form the foundation of the ‘open possibilities’.