Safety Study of Stemchymal® in Acute Liver Failure

Inclusion Criteria: 1. ALF or ACLF patients. 2. Subjects are between 20 and 70 years of age. 3. MELD scores meet 17 ≤ MELD ≤ 26. 4. Subjects who had completed signing informed consent. Exclusion Criteria: 1. Subjects who had been enrolled in any other cell therapy within six months. 2. Females with a positive pregnancy test result. 3. Subjects have contraindication for liver transplantation. 4. Subjects with psychiatric illnesses. 5. Subjects who are diagnosed as active tuberculosis (TB). 6. Subjects with immunological disorders (e.g. autoimmune hepatitis) or using immunosuppressive drugs (e.g. steroid for immunosuppression) within six months prior to screening visit. 7. Subjects with unstable illnesses or contraindication for this clinical trial according to investigator's judgment.