The renewal of the signage system at the National Maritime Museum of Korea was a design project that symbolically expressed the coexistence and mutual respect between humans and the sea. The concept focused on human resilience in harmony with nature, using materials and forms that emphasized durability and sustainability. Indoors, white tones and black-and-white artificial marble were used to evoke a sense of calm and clarity, representing a peaceful relationship with a gentle sea, rather than a turbulent one. Outdoors, UHPC (Ultra-High-Performance Concrete) was employed to reflect strength and endurance, capable of withstanding harsh coastal conditions, and symbolizing humanity’s courage to explore beyond limits. More than a simple signage upgrade, the project served as a meaningful reflection on how humans interact with nature, inviting visitors to reconsider our relationship with the environment—especially the ocean—in today’s ecological context.