The aim of this study is to evaluate the safety and efficacy of Cohesive Silicone Gel-Filled Breast Implant (CoSBI) produced by HansBiomed co.,Ltd. in breast reconstruction or augmentation

Inclusion Criteria:

• Over 22 years of age
• Subjects who want breast augmentation reconstruction following breast cancer, congenital or accidental unbalanced breast size
• Negative pregnancy test in fertile women
• Subjects who voluntarily decided the participation of the study and signed the informed consent
• Subjects who can understand and comply with the instructions and participate during the entire period of the trial

Exclusion Criteria:

• previous breast reconstruction or augmentation history
• self -immune disease
• uncontrolled active infectious disease
• unable to insert beast implant due to radiotherapy
• Patients who have recurrent breast cancer or do not treat effectively their cancer
• Keloid
• Abnormal blood test or ECG result for general anesthesia
• Patients who cannot MRI scan due to having Metallic substance in the body or Claustrophobia
• Aesthetic addiction, drug abuse, alcohol abuse
• Patients who are not eligible for this study at the medical discretion of the Principal Investigator or Sub-investigator