Evaluation of Efficacy and Safety of Single and Multiple Therapy of Herbal Medicine/Chuna Therapy on Non-specific Chronic Low Back Pain: A Study Protocol for Multicenter, 3-arm, Randomized, Single Blinded, Parallel Group, Incomplete Factorial Design, Pilot Study -

Inclusion Criteria: * Inpatients with chief complaint of low back pain in oriental rehabilitation medical center * Age 19 - 65 * Patients who have 4 \~7 cm of VAS pain score; * Ability to have normal communication * Ability to give informed consent Exclusion Criteria: * Patients with pain duration of 3 months or less * Patients with progressive neurologic deficit or severe neurologic symptoms by SLR test * Patients diagnosed with serious pathology(s) which may cause low back pain (e.g. spinal metastasis of tumor(s), acute fracture, etc) * Patients with spondylolisthesis or spondylolysis(diagnosed with grade II or higher level) * Patients currently taking steroids, immunosuppressants, medicine for mental illness or other medication(s) that may interfere with study results * Patients with history of spinal surgery * Patients with more severe pain than pain caused by low back pain * Those who do not (cannot) abide by treatment and follow up due to the mental illness such as behavior disorder, depression, anxiety neurosis etc. * Patients with history of Medical Malpractice Case * Patients with treatment history of low back pain within 1 month either KM or WM * Patients participating in other clinical studies within 3 months * Pregnant patients or patients with plans of pregnancy or lactating patients * Patients disagree to sign the informed consent form * Patients deemed unsuitable for participating the trial by the researchers