A Study of LC542019 in Healthy Subjects and Subjects With T2DM

For healthy subjects: Inclusion criteria * Adults ≥ 18 to ≤ 55 years. * Body mass index (BMI) ≥18.5 to ≤ 30.0 kg/m2 * Female subjects must be non-pregnant and non-lactating. Females of childbearing potential must use at least two of the medically accepted contraceptive methods, table at least 4 weeks prior to the screening. * Ability to provide written informed consent. Exclusion Criteria * History of or current diagnosis of Diabetes Mellitus Type 1 or Diabetes Mellitus Type 2 * History of or current significant diagnosis of cardiovascular, respiratory, hepatic, renal, gastrointestinal endocrine, hematological, or neurological disorders or abnormalities, or other major systemic disease * History of or presence of clinically significant ECG findings * History of or acute significant gastrointestinal disorder For T2DM subjects: Inclusion criteria * Adults ≥ 18 to ≤ 70 years. * Body mass index (BMI) ≥18.5 to ≤ 35.0 kg/m2 with stable body weight by history for 3 months * Subjects with T2DM \> 6 months, on stable therapy with metformin monotherapy. * Female subjects must be non-pregnant and non-lactating. Females of childbearing potential must use at least two of the medically accepted contraceptive methods, table at least 4 weeks prior to the screening. * Ability to provide written informed consent. Exclusion Criteria * History of or current diagnosis of Diabetes Mellitus Type 1 * A subject who has acute proliferative retinopathy or maculopathy, severe gastroparesis, and/or severe neuropathy, especially autonomic neuropathy * Recurrent major hypoglycemia or hypoglycemic unawareness or recent ketoacidosis * Current use of any prescribed or non-prescribed drugs (other than current treatment for diabetes mellitus or birth control methods)