This study evaluates the addition of dapagliflozin in the treatment of type 2 diabetes with metformin and evogliptin combination therapy. Half of subjects will receive dapagliflozin, metformin and evogliptin, while the other half will receive placebo, metformin and evogliptin.

Inclusion Criteria:

1. Patients with type II diabetes mellitus aged 19 years or older
2. Patients who had taken metformin(≥1000mg/day) and DPP(dipeptidyl peptidase)-4 inhibitor combination therapy(or complex is allowed) at the same dose for at least 8 weeks prior to the screening visit
3. Patients with fasting plasma glucose≤250mg/dL at the screening visit
4. Patients with 18.5kg/m^2≤BMI≤40kg/m^2 at the screening visit
5. Patients who have signed an informed consent themselves after receiving detailed explanation about the clinical study

Exclusion Criteria:

1. Patients with type 1 diabetes, secondary diabetes, gestational diabetes, diabetic coma or -pre-coma, metabolic acidosis including lactic acidosis and diabetic ketoacidosis
2. Patients with a medical history of New York Heart Association(NYHA) class III~IV heart failure or with congestive heart failure, acute and unstable heart failure
3. Patients with severe infectious disease or severe traumatic systemic disorders
4. Patients with hypopituitarism or adrenal insufficiency, pulmonary infarction, severe pulmonary dysfunction and other hypoxemia
5. Patients with galactose intolerance, lapp lactase deficiency, glucose-galactose malabsorption
6. Patients with moderate to severe stage renal disease, end stage renal disease, dialysis at the time of screening visit