Maekmoondong-tang on Post-operative Cough in Patients With Lung Cancer

Inclusion Criteria: * Adults over 20 years old. * Patients undergone segmentectomy or lobectomy for lung cancer within 1 month * Patients who do not or poorly respond to one week administration of common antitussive agents. * Eastern Cooperative Oncology Group(ECOG) 0 to 2 * Participant is willing and able to give informed consent for participation in the study Exclusion Criteria: * Patients undergoing adjuvant chemotherapy. * Patients who have been diagnosed with acute respiratory disease within 1 month. * Patients who have been diagnosed with bronchial asthma or bronchiectasis within 1 year * Patients taking Angiotensin Converting Enzyme Inhibitor * Patients with pseudoaldosteronism. * Participants who have known prior hypersensitivity to any investigational product component * Patient with acute or chronic infections requiring treatment (active HAV, HBV, HCV, HIV, TB) * Pregnant or lactating females * Women of childbearing potential * Patient who do not agrees to use effective means of contraception and not to donate sperm during the trial and up to 1 month after final administration * Patient who participated other clinical trials of medicine or medical devices within 1 month * Individuals who are judged inappropriate for the study by investigator