Study to Evaluate the Non-inferiority of Cavir in HBeAg(+)Chronic Hepatitis B Patients Treated With Baraclude

Inclusion Criteria: * Patients (over the19 years of age) currently taking Baraclude® monotherapy for chronic HBV infection for at least 24 month with \< HBV DNA 60 IU/mL level, HBeAg positive and HBeAb negative status at screening. Exclusion Criteria: * Patients are diagnosed Hepatitis cancer and hepatocellular carcinoma (HCC) * Patient has concomitant other chronic viral infection (HAV/Hepatitis C Virus (HCV)/Hepatitis D Virus(HDV)/HIV) * Patient had documented resistance mutations at any time before or at screening * Patient has clinically confirmed alcoholism, autoimmune hepatitis, malignancy with hepatic involvement, hemochromatosis, alpha-1 antitrypsin deficiency and Wilson's Disease. * Patient has received antiviral agent including interferon other than Baraclude within 24 months before screening for this study. * Patient has received immunosuppressive agent within 24 weeks before screening or corticosteroids for 4 weeks. * Clinical signs as indicated by any one of the following: Ccr(Cockroft-Gault) \< 50ml/min, Total bilirubin \> 3.0 mg/dl, Albumin \< 2.7 g/dl, Prothrombin time \> INR 2.3 * Patient is pregnant or breastfeeding or willing to be pregnant * Patient has malignancy except for thyroid cancer and Borderline malignancy.a history of treated malignancy is allowable if the patient's malignancy has been in complete remission, off chemotherapy and without additional surgical intervention, during the preceding five years