A ‘Blowfish’ is a fish that responds to the environment by puffing itself up to protect itself in situations where survival is necessary. The existing building, which was built a long while ago on a triangular site, gains a different location environment in this land as the US Army Garrison Yongsan is turned into a park. However, as the existing facility gradually changed its external materials and forms several times since it was first built and functioned from time to time depending on the various situations of the city, it stood there as an abstracted piece of structure without an identity