Open-label, Multi-center Trial to Evaluate Safety and Efficacy of Cohesive Silicone Gel-Filled Breast Implants UNIGEL®

Inclusion Criteria: * Has given written informed consent to entry * Female, 22 years to 60 years * Breast augmentation(cosmetic surgery) is for following subjects * Who is not content with breast size and shape * Who has congenital asymmetrical deformity * subject who agree to MRI scan during the trial * subject who agree to visit to hospital according to schedule specified in the protocol during the entire period of the trial Exclusion Criteria: * Pregnant or lactating women and women of childbearing age * Subject who has operation history of breast augmentation or reconstruction * Subject who has fibrocystic Breast Disease coming up for precancerous lesion not accompanied with subcutaneous mastectomy * Subject who has breast cancer or prodromal phase and no proper treatment. * Subject who is diagnosed with Breast Imaging-Reporting and Data System(BI-RADS) category 3 under breast ultrasonography. * Subject who has uncontrolled active infectious disease or abscess * Autoimmune disease * Diabetes mellitus * Keloidosis * Subject who cannot take general anesthesia due to abnormal blood or ECG results. * Subject who is not appropriate for breast augmentation due to damaged tissue or blood vessel or ulcer * Subject who has metal materials in a body such as ventricular assist system or cerebral aneurysm clips, or has claustrophobia (not suitable for MRI SCAN) * Physically/mentally disabled subject that may disturb understanding and cooperation for the trial. * Any other conditions that may interfere with correct assessment of the trial.