Hyecheongwan, the main building of DST, was designed by Junglim Architecture about thirty years ago. The use of this building had changed over time with such new functions as library, lecture hall, and administrative office, finally becoming short of new capacity. This project of extension was to resolve the lack of space for education and to reflect the symbolism of educational space. It is expected to satisfy the desire of the client who has kept a long relationship with Junglim and to develop into a site of learning that enables change and a new leap forward.