Hantaviruses are found worldwide and are known to cause two serious and often fatal human disease: hemorrhagic fever with renal syndrome(HFRS) and hantavirus pulmonary syndrome(HPS). The typical clinical prodrome consists of fever, chills, myalgia, headache, and gastrointestinal symptoms. Treatment usually involves maintenance of fluids, blood pressure, ventilation and electrolytes. We report a patient who had multisystem inflammatory symptom with Hantaan virus antibody positive accompanied by mild fever and myalgia. This case was diagnosed as HFRS. This patient was treated by Galgun hegi-tang. As a result of this treatment, symptoms were markedly improved.